10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended September 30, 2012

or

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Transition Period from                    to

Commission File No. 001-32260

Westlake Chemical Corporation

(Exact name of Registrant as specified in its charter)

Delaware	76-0346924
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

2801 Post Oak Boulevard, Suite 600

Houston, Texas 77056

(Address of principal executive offices, including zip code)

(713) 960-9111

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     YesxNo¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     YesxNo¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)     Yes¨Nox

The number of shares outstanding of the registrant’s sole class of common stock as of November 2, 2012 was 66,698,174.

INDEX

Item	Page
PART I. FINANCIAL INFORMATION
1) Financial Statements	1
2) Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
3) Quantitative and Qualitative Disclosures about Market Risk	33
4) Controls and Procedures	33
PART II. OTHER INFORMATION
1) Legal Proceedings	34
1A) Risk Factors	34
2) Unregistered Sales of Equity Securities and Use of Proceeds	34
6) Exhibits	35

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	September 30, 2012			December 31, 2011
	(in thousands of dollars, except par values and share amounts)
ASSETS
Current assets
Cash and cash equivalents	$	1,198,468		$	825,901
Accounts receivable, net	393,592			407,372
Inventories	371,537			490,777
Prepaid expenses and other current assets	14,472			12,495
Deferred income taxes	19,736			19,611
Total current assets	1,997,805			1,756,156
Property, plant and equipment, net	1,394,198			1,232,066
Equity investments	44,174			46,741
Restricted cash	—			96,283
Other assets, net	107,997			135,575
Total assets	$	3,544,174		$	3,266,821
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities
Accounts payable	$	199,438		$	227,034
Accrued liabilities	163,369			137,561
Total current liabilities	362,807			364,595
Long-term debt	763,731			764,563
Deferred income taxes	335,394			330,791
Other liabilities	48,814			50,560
Total liabilities	1,510,746			1,510,509
Commitments and contingencies (Notes 6 and 13)
Stockholders’ equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized;    no shares issued and outstanding	—			—
Common stock, $0.01 par value, 150,000,000 shares authorized;    66,981,077 and 66,601,909 shares issued at September 30, 2012    and December 31, 2011, respectively	670			666
Common stock, held in treasury, at cost; 284,493 and 69,816 shares    at September 30, 2012 and December 31, 2011, respectively	(13,302		)	(2,518		)
Additional paid-in capital	486,852			467,796
Retained earnings	1,567,371			1,299,438
Accumulated other comprehensive loss	(8,163		)	(9,070		)
Total stockholders’ equity	2,033,428			1,756,312
Total liabilities and stockholders’ equity	$	3,544,174		$	3,266,821

The accompanying notes are an integral part of these consolidated financial statements.

1

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(in thousands of dollars, except per share data and share amounts)
Net sales	$	821,175		$	968,372		$	2,770,000		$	2,760,673
Cost of sales	648,996			821,305			2,223,288			2,278,927
Gross profit	172,179			147,067			546,712			481,746
Selling, general and administrative expenses	29,662			29,736			87,592			85,409
Income from operations	142,517			117,331			459,120			396,337
Other income (expense)
Interest expense	(11,934		)	(12,727		)	(35,682		)	(38,449		)
Debt retirement costs	(7,082		)	—			(7,082		)	—
Gain from sales of equity securities	477			—			16,429			—
Other income, net	1,222			1,457			3,676			4,296
Income before income taxes	125,200			106,061			436,461			362,184
Provision for income taxes	38,236			38,131			146,183			129,661
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Earnings per share:
Basic	$	1.30		$	1.02		$	4.36		$	3.50
Diluted	$	1.30		$	1.01		$	4.33		$	3.48
Weighted average shares outstanding:
Basic	66,311,958			66,012,102			66,240,225			65,919,892
Diluted	66,656,760			66,381,932			66,621,520			66,307,604
Dividends per common share	$	0.1875		$	0.0738		$	0.3350		$	0.2008

The accompanying notes are an integral part of these consolidated financial statements.

2

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(in thousands of dollars)
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Other comprehensive income (loss)
Pension and other post-retirement benefits liability
Pension and other post-retirement reserves    adjustment (excluding amortization)	72			—			142			—
Amortization of benefits liability	584			471			1,747			1,395
Income tax provision on pension and other    post-retirement benefits liability	(252		)	(185		)	(725		)	(548		)
Foreign currency translation adjustments	865			(1,054		)	928			(730		)
Reclassification of net cash flow hedge losses    to net income	521			—			—			—
Available-for-sale investments
Unrealized holding gains (losses) on    investments	339			(6,659		)	14,582			(6,659		)
Income tax provision on unrealized    holding gains	(121		)	—			(5,229		)	—
Reclassification of net realized gain to    net income	(306		)	—			(10,538		)	—
Other comprehensive income (loss)	1,702			(7,427		)	907			(6,542		)
Comprehensive income	$	88,666		$	60,503		$	291,185		$	225,981

The accompanying notes are an integral part of these consolidated financial statements.

3

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine Months Ended September 30,
	2012			2011
	(in thousands of dollars)
Cash flows from operating activities
Net income	$	290,278		$	232,523
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	109,601			98,244
(Recovery of) provision for doubtful accounts	(536		)	917
Amortization of debt issuance costs	1,149			1,289
Stock-based compensation expense	4,640			4,762
Loss from disposition of fixed assets	1,945			1,022
Gain from sales of equity securities	(16,429		)	—
Impairment of long-lived assets	—			1,975
Write-off of debt issuance costs	1,277			—
Deferred income taxes	4,385			19,435
Equity in loss (income) of joint ventures	2,567			(2,443		)
Changes in operating assets and liabilities
Accounts receivable	13,732			(100,524		)
Inventories	119,240			(16,220		)
Prepaid expenses and other current assets	(1,977		)	4,039
Accounts payable	(35,651		)	(9,558		)
Accrued liabilities	20,077			14,330
Other, net	(13,675		)	(5,438		)
Net cash provided by operating activities	500,623			244,353
Cash flows from investing activities
Additions to property, plant and equipment	(235,463		)	(111,823		)
Construction of assets pending sale-leaseback	(5,484		)	—
Proceeds from disposition of assets	435			2,456
Proceeds from repayment of loan to affiliate	763			763
Proceeds from sales of equity securities	47,655			—
Purchase of investments	(2,961		)	(29,877		)
Settlements of derivative instruments	471			(331		)
Net cash used for investing activities	(194,584		)	(138,812		)
Cash flows from financing activities
Capitalized debt issuance costs	(2,221		)	(2,540		)
Dividends paid	(22,345		)	(13,359		)
Proceeds from borrowings	248,818			—
Proceeds from exercise of stock options	6,627			5,323
Repayment of borrowings	(250,000		)	—
Repurchase of common stock for treasury	(10,784		)	(19		)
Utilization of restricted cash	96,433			33,694
Net cash provided by financing activities	66,528			23,099
Net increase in cash and cash equivalents	372,567			128,640
Cash and cash equivalents at beginning of period	825,901			630,299
Cash and cash equivalents at end of period	$	1,198,468		$	758,939

The accompanying notes are an integral part of these consolidated financial statements.

4

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

1. Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2011 financial statements and notes thereto of Westlake Chemical Corporation (the “Company”) included in the annual report on Form 10-K for the fiscal year ended December 31, 2011, filed with the SEC on February 23, 2012. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2011.

In the opinion of the Company’s management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company’s financial position as of September 30, 2012, its results of operations for the three and nine months ended September 30, 2012 and 2011 and the changes in its cash position for the nine months ended September 30, 2012 and 2011.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the year ending December 31, 2012 or any other interim period. The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Recent Accounting Pronouncements

Fair Value Measurement

In May 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update changing some fair value measurement principles, such as by prohibiting the application of a blockage factor in fair value measurements and only requiring the application of the highest and best use concept when measuring nonfinancial assets. The accounting guidance requires, for recurring Level 3 fair value measurements, disclosure of quantitative information about unobservable inputs used, a description of the valuation processes used and a qualitative discussion about the sensitivity of the measurements. The accounting guidance further requires new disclosures about the use of a nonfinancial asset measured or disclosed at fair value if its use differs from its highest and best use. In addition, entities must report the fair value hierarchy level of assets and liabilities not recorded at fair value but where fair value is disclosed. The Company adopted the new fair value measurement guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

Presentation of Other Comprehensive Income

In June 2011, the FASB issued an accounting standards update on the presentation of other comprehensive income. The new accounting guidance eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity. The new standard allows companies to present net income and other comprehensive income either in one continuous statement or in two separate, but consecutive, statements. The FASB issued another accounting standards update on the presentation of other comprehensive income in December 2011, deferring the effective date for amendments to the presentation of reclassification adjustments of items out of accumulated other comprehensive income. In the interim, reclassifications out of accumulated other comprehensive income should be presented consistent with the current presentation requirements. All other requirements of the June 2011 accounting standards update are not affected by the December 2011 update. With the exception of the presentation of reclassification adjustments of items out of accumulated other comprehensive income, the Company adopted the guidance pertaining to the presentation of other comprehensive income as of January 1, 2012, and the adoption did not have an impact on the Company’s consolidated financial position or results of operations.

5

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Testing Goodwill for Impairment

In September 2011, the FASB issued an accounting standards update to simplify how entities test goodwill for impairment. The new accounting guidance provides an entity with an option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test under current accounting guidance. If an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test. Also under this new accounting guidance, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test, but may resume performing the qualitative assessment in any subsequent period. The Company adopted the new goodwill impairment test guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

Disclosures about Offsetting Assets and Liabilities

In December 2011, the FASB issued an accounting standards update on disclosures for offsetting assets and liabilities. The new accounting guidance requires companies to disclose both gross and net information about (1) instruments and transactions eligible for offset in the statement of financial position, and (2) instruments and transactions subject to an agreement similar to a master netting arrangement. The accounting standards update will be effective for reporting periods beginning on or after January 1, 2013 and is not expected to have an impact on the Company’s consolidated financial position or results of operations.

Testing Indefinite-Lived Intangible Assets for Impairment

In July 2012, the FASB issued an accounting standards update to simplify how entities test indefinite-lived intangible assets for impairment and to improve consistency in impairment testing guidance among long-lived asset categories. The new accounting guidance provides an entity with an option to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test under current accounting guidance. If an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with current accounting guidance. Also under this new accounting guidance, an entity has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test, but may resume performing the qualitative assessment in any subsequent period. The Company will adopt the new indefinite-lived intangible assets test guidance for the quarter ending March 31, 2013, but it is not expected to have a material impact on the Company's consolidated financial position or results of operations.

2. Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2012			December 31, 2011
Trade customers	$	375,389		$	391,401
Affiliates	226			122
Allowance for doubtful accounts	(10,487		)	(10,969		)
	365,128			380,554
Federal and state taxes	13,151			16,113
Other	15,313			10,705
Accounts receivable, net	$	393,592		$	407,372

6

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

3. Inventories

Inventories consist of the following:

	September 30, 2012		December 31, 2011
Finished products	$	174,724	$	234,830
Feedstock, additives and chemicals	144,140		207,899
Materials and supplies	52,673		48,048
Inventories	$	371,537	$	490,777

4. Property, Plant and Equipment

As of September 30, 2012, the Company had property, plant and equipment totaling $1,394,198. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Construction of assets pending sale-leaseback included in property, plant and equipment, net in the consolidated balance sheet at September 30, 2012 was $5,484 and pertained to the construction of transportation equipment.

Depreciation expense on property, plant and equipment of $30,055 and $27,623 is included in cost of sales in the consolidated statements of operations for the three months ended September 30, 2012 and 2011, respectively. Depreciation expense on property, plant and equipment of $90,615 and $82,423 is included in cost of sales in the consolidated statements of operations for the nine months ended September 30, 2012 and 2011, respectively.

5. Other Assets

There were no investments reflected in other assets, net in the consolidated balance sheet at September 30, 2012 as the Company completed the liquidation of its holdings of equity securities during the third quarter of 2012. Investments reflected in other assets, net at December 31, 2011 was $30,113. These investments in equity securities were classified as available-for-sale.

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale investments at December 31, 2011 were as follows:

	December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Available-for-sale equity securities	$	28,265	$	1,981	$	(133	)	$	30,113

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

_____________

As of December 31, 2011, an unrealized gain of $1,185, net of income tax expense of $663, was recorded in accumulated other comprehensive income. See Note 9 for the fair value hierarchy of the Company’s available-for-sale equity securities.

7

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The proceeds from sales of available-for-sale equity securities and the gross realized gains included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Proceeds from sales of available-for-sale equity securities	$	1,628	$	—	$	47,655	$	—
Gross realized gains	$	477	$	—	$	16,429	$	—

Amortization expense on other assets of $8,717 and $5,664 is included in the consolidated statements of operations for the three months ended September 30, 2012 and 2011, respectively. Amortization expense on other assets of $20,135 and $17,110 is included in the consolidated statements of operations for the nine months ended September 30, 2012 and 2011, respectively.

6. Long-Term Debt

Long-term debt consists of the following:

	September 30, 2012		December 31, 2011
6 5/8% senior notes due 2016	$	—	$	249,674
3.60% senior notes due 2022	248,842		—
6 1/2% senior notes due 2029	100,000		100,000
6 3/4% senior notes due 2032	250,000		250,000
6 1/2% senior notes due 2035 (the “6 1/2% GO Zone Senior Notes Due 2035”)	89,000		89,000
6 1/2% senior notes due 2035 (the “6 1/2% IKE Zone Senior Notes Due 2035 ”)	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt	$	763,731	$	764,563

3.60% Senior Notes due 2022 and 6 ⁵/8% Senior Notes due 2016

On July 17, 2012, the Company issued $250,000 aggregate principal amount of its 3.60% senior notes due 2022 (the “2022 Notes”). On July 30, 2012, the Company voluntarily redeemed all $250,000 aggregate principal amount of its 6 ⁵/8% senior notes due 2016 (the “2016 Notes”) at a redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. The Company used the net proceeds from the issuance of the 2022 Notes, plus cash on hand, to pay the redemption price of the 2016 Notes. As a result of the early redemption of the 2016 Notes, the Company recognized $7,082 in non-operating expense in the third quarter of 2012 consisting primarily of a pre-payment premium of $5,520 and a write-off of $1,277 in previously capitalized debt issuance costs.

The 2022 Notes are unsecured and were issued with an original issue discount of $1,183. There is no sinking fund and no scheduled amortization of the 2022 Notes prior to maturity. The Company may optionally redeem the 2022 Notes at any time and from time to time prior to April 15, 2022 (three months prior to the maturity date) for 100% of the principal plus accrued interest and a discounted "make whole" payment of remaining unpaid principal and interest payments. On or after April 15, 2022, the Company may optionally redeem the 2022 Notes for 100% of the principal plus accrued interest. The holders of the 2022 Notes may require the Company to repurchase the 2022 Notes at a price of 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase, upon the occurrence of both a “change of control” and, within 60 days of such change of control, a “below investment grade rating event” (as such terms are defined in the indenture governing the 2022 Notes). All domestic subsidiaries of the Company that guarantee other indebtedness of the Company or of another guarantor of the 2022 Notes in excess of $5,000 are guarantors of the 2022 Notes.

The indenture governing the 2022 Notes contains customary events of default and covenants that will restrict the Company's and certain of its subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of the Company's assets.

8

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Revolving Credit Facility

The Company has a $400,000 senior secured revolving credit facility. At September 30, 2012, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of September 30, 2012, the Company had outstanding letters of credit totaling $16,214 and borrowing availability of $365,865 under the revolving credit facility.

7. Stock-Based Compensation

Under the Westlake Chemical Corporation 2004 Omnibus Incentive Plan (the “2004 Plan”), all employees and nonemployee directors of the Company, as well as certain individuals who have agreed to become the Company’s employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2004 Plan. At the discretion of the administrator of the 2004 Plan, employees and nonemployee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards or cash awards (any of which may be a performance award). Total stock-based compensation expense related to the 2004 Plan was $1,515 and $1,636 for the three months ended September 30, 2012 and 2011, respectively, and $4,640 and $4,762 for the nine months ended September 30, 2012 and 2011, respectively.

8. Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

For derivative instruments that are designated and qualify as fair value hedges, the gains or losses on the derivative instruments, as well as the offsetting losses or gains on the hedged items attributable to the hedged risk, were included in cost of sales in the consolidated statements of operations for the three and nine months ended September 30, 2012 and 2011. As of September 30, 2012, the Company had 53,550,000 gallons of feedstock forward contracts designated as fair value hedges.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in cost of sales in the consolidated statements of operations for the three and nine months ended September 30, 2012 and 2011.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

Interest Rate Risk Management

In order to manage its interest rate risk, the Company may enter into Treasury lock agreements to fix the Treasury yield component of the interest cost associated with anticipated financings and designate these Treasury locks as cash flow hedges.

During June and July 2012, the Company entered into several Treasury lock agreements to fix the Treasury yield component of the interest cost of financing the issuance of senior notes. The Company refinanced all $250,000 aggregate principal amount of the 2016 Notes through the issuance of $250,000 aggregate principal amount of the 2022 Notes in July 2012. Also in July 2012, the Company settled all Treasury lock agreements associated with the issuance of the 2022 Notes with an aggregate payment of $1,940 to the counterparties due to a decrease in the 10-year Treasury rates between inception and settlement of the Treasury lock agreements.

9

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The fair values of derivative instruments in the Company’s consolidated balance sheets were as follows:

	Asset Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	8,630	$	—
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	1,213		2,437
Total asset derivatives		$	9,843	$	2,437

	Liability Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	1,019	$	3,262
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	1,873		973
Total liability derivatives		$	2,892	$	4,235

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company’s consolidated statements of operations. For the three and nine months ended September 30, 2012, there was no material ineffectiveness with regard to the Company’s qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Commodity forward contracts	Cost of sales	$	(515	)	$	(1,780	)	$	12,345		$	(1,780	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Firm commitment designated as the    hedged item	Cost of sales	$	515		$	1,780		$	(13,546	)	$	1,780

The following table reflects the impact of derivative instruments designated as cash flow hedges on the Company’s consolidated statements of operations for the three and nine months ended September 30, 2012.

Derivatives in Cash Flow    Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Three Months Ended September 30,					Nine Months Ended September 30,
		2012			2011		2012			2011
Treasury lock agreements	Interest expense	$	(813	)	$	—	$	(813	)	$	—

10

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The impact of derivative instruments that have not been designated as hedges on the Company’s consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012			2011
Commodity forward contracts	Cost of sales	$	249	$	371	$	(783	)	$	838

See Note 9 for the fair value of the Company’s derivative instruments.

9. Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following tables summarize, by level within the fair value hierarchy, the Company’s assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2012
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,213	$	8,630		$	9,843
Risk management liabilities - Commodity forward contracts	—		(2,892		)	(2,892		)
Firm commitments
Hedged portion of firm commitment	—		1,019			1,019
Hedged portion of firm commitment	—		(8,630		)	(8,630		)
	December 31, 2011
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,090	$	1,347		$	2,437
Risk management liabilities - Commodity forward contracts	—		(4,235		)	(4,235		)
Firm commitments
Hedged portion of firm commitment	—		3,262			3,262
Marketable securities
Available-for-sale equity securities	30,113		—			30,113

The Level 2 measurements are derived using forward curves supplied by industry recognized and unrelated third-party services. There were no transfers in and out of Levels 1 and 2 of the fair value hierarchy for the nine months ended September 30, 2012 and 2011.

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company’s long-term debt are summarized in the table below. The Company’s long-term debt instruments are publicly-traded. A market approach, based upon quotes from

11

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

financial reporting services, is used to measure the fair value of the Company’s long-term debt. Because the Company’s long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company’s long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	September 30, 2012				December 31, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
6 5/8% senior notes due 2016	$	—	$	—	$	249,674	$	254,890
3.60% senior notes due 2022	248,842		253,738		—		—
6 1/2% senior notes due 2029	100,000		115,619		100,000		108,834
6 3/4% senior notes due 2032	250,000		288,515		250,000		263,988
6 1/2% GO Zone Senior Notes Due 2035	89,000		103,031		89,000		93,090
6 1/2% IKE Zone Senior Notes Due 2035	65,000		75,247		65,000		67,987
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

10. Income Taxes

The effective income tax rate was 33.5% for the nine months ended September 30, 2012. The effective income tax rate for the 2012 period was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, partially offset by state income taxes. The effective income tax rate was 35.8% for the nine months ended September 30, 2011. The effective income tax rate for the 2011 period was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

Management anticipates no material reductions to the total amount of unrecognized tax benefits within the next twelve months.

The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. As of September 30, 2012, the Company had no material accrued interest and penalties related to uncertain tax positions.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2005. In January 2012, the Internal Revenue Service completed the audit of the Company for the 2009 tax year with no assessment.

11. Earnings per Share

The Company has unvested shares of restricted stock outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Less:
Net income attributable to participating securities	(452		)	(598		)	(1,682		)	(2,087		)
Net income attributable to common shareholders	$	86,512		$	67,332		$	288,596		$	230,436

12

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Weighted average common shares—basic	66,311,958		66,012,102		66,240,225		65,919,892
Plus incremental shares from:
Assumed exercise of options	344,802		369,830		381,295		387,712
Weighted average common shares—diluted	66,656,760		66,381,932		66,621,520		66,307,604
Earnings per share:
Basic	$	1.30	$	1.02	$	4.36	$	3.50
Diluted	$	1.30	$	1.01	$	4.33	$	3.48

Excluded from the computation of diluted earnings per share are options to purchase 168,362 and 99,592 shares of common stock for the three months ended September 30, 2012 and 2011, respectively, and 293,062 and 151,923 shares of common stock for the nine months ended September 30, 2012 and 2011, respectively. These options were outstanding during the periods reported but were excluded because the option exercise price was greater than the average market price of the shares.

12. Pension and Post-Retirement Benefit Costs

Components of net periodic benefit cost are as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	Pension						Post-retirement Healthcare				Pension						Post-retirement Healthcare
	2012			2011			2012		2011		2012			2011			2012		2011
Service cost	$	250		$	224		$	2	$	4	$	754		$	705		$	7	$	12
Interest cost	645			681			185		209		1,936			2,042			555		628
Expected return on plan assets	(623		)	(570		)	—		—		(1,867		)	(1,709		)	—		—
Amortization of transition    obligation	—			—			—		28		—			—			—		85
Amortization of prior service    cost	74			74			21		47		223			223			63		140
Amortization of net loss	445			322			44		28		1,329			948			132		84
Net periodic benefit cost	$	791		$	731		$	252	$	316	$	2,375		$	2,209		$	757	$	949

The Company contributed $2,283 and $1,692 to the Salaried pension plan in the first nine months of 2012 and 2011, respectively, and contributed $1,542 and $1,362 to the Wage pension plan in the first nine months of 2012 and 2011, respectively. The Company expects to make additional contributions of $579 to the Salaried pension plan and $381 to the Wage pension plan during the year ending December 31, 2012.

13. Commitments and Contingencies

The Company is subject to environmental laws and regulations that can impose civil and criminal sanctions and that may require it to mitigate the effects of contamination caused by the release or disposal of hazardous substances into the environment. Under one law, an owner or operator of property may be held strictly liable for remediating contamination without regard to whether that person caused the contamination, and without regard to whether the practices that resulted in the contamination were legal at the time they occurred. Because several of the Company’s production sites have a history of industrial use, it is impossible to predict precisely what effect these legal requirements will have on the Company.

13

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation (“Goodrich”) chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company’s operations. The soil and groundwater at the complex, which does not include the Company’s nearby PVC facility, had been extensively contaminated under Goodrich’s operations. In 1993, Goodrich spun off the predecessor of PolyOne Corporation (“PolyOne”), and that predecessor assumed Goodrich’s indemnification obligations relating to preexisting contamination.

In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties, incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company’s provision to or on behalf of PolyOne of certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex do not have a specified termination date but are expected to last for the foreseeable future. The costs incurred by PolyOne to provide the environmental remediation services were $3,287 in 2011. On March 17, 2010, the Company received notice of PolyOne’s intention to commence an arbitration proceeding under the settlement agreement. In this proceeding, PolyOne seeks to readjust the percentage allocation of costs and to recover approximately $1,400 from the Company in reimbursement of previously paid remediation costs. The arbitration is currently stayed.

Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky Environmental and Public Protection Cabinet (the “Cabinet”) re-issued Goodrich’s Resource Conservation and Recovery Act (“RCRA”) permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich’s clean-up obligations under the permit to the Company. The Company intervened in the proceedings. The Cabinet has suspended all corrective action under the RCRA permit in deference to a remedial investigation and feasibility study (“RIFS”) being conducted pursuant to an Administrative Settlement Agreement (“AOC”), which became effective on December 9, 2009. See “Change in Regulatory Regime” below. The proceedings have been postponed. Periodic status conferences will be held to evaluate whether additional proceedings will be required. On September 19, 2011, the Company filed a motion to dismiss the proceedings, which was denied on December 29, 2011.

Change in Regulatory Regime. In May 2009, the Cabinet sent a letter to the U.S. Environmental Protection Agency (“EPA”) requesting the EPA’s assistance in addressing contamination at the Calvert City site under the U.S. Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”). In its response to the Cabinet also in May 2009, the EPA stated that it concurred with the Cabinet’s request and would incorporate work previously conducted under the Cabinet’s RCRA authority into the EPA’s cleanup efforts under CERCLA. Since 1983, the EPA has been addressing contamination at an abandoned landfill adjacent to the Company’s plant which had been operated by Goodrich and which was being remediated pursuant to CERCLA. During the past two years, the EPA has directed Goodrich and PolyOne to conduct additional investigation activities at the landfill and at the Company’s plant. In June 2009, the EPA notified the Company that the Company may have potential liability under section 107(a) of CERCLA at its plant site. Liability under section 107(a) of CERCLA is strict and joint and several. The EPA also identified Goodrich and PolyOne, among others, as potentially responsible parties at the plant site. The Company negotiated, in conjunction with the other potentially responsible parties, the AOC and an order to conduct the RIFS. The parties submitted and received EPA approval for a RIFS work plan to implement the AOC. The parties are currently conducting the RIFS.

Monetary Relief. Except as noted above with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, none of the court, the Cabinet nor the EPA has established any allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. At this time, the Company is not able to estimate the loss or reasonable possible loss, if any, on the Company’s financial statements that could result from the resolution of these proceedings. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

14

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

EPA Audit of Ethylene Units in Lake Charles. During 2007, the EPA conducted an audit of the Company’s ethylene units in Lake Charles, Louisiana, with a focus on leak detection and repair, or LDAR. As a result of the audit, the EPA brought allegations that the Company had violated certain environmental laws and regulations pertaining to LDAR. The Company has agreed to settle this matter, subject to court approval, by paying a cash penalty of $500 and has recorded an accrual in such amount.

In addition to the matters described above, the Company is involved in various routine legal proceedings incidental to the conduct of its business. The Company does not believe that any of these routine legal proceedings will have a material adverse effect on its financial condition, results of operations or cash flows.

14. Segment Information

The Company operates in two principal business segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net external sales
Olefins
Polyethylene	$	431,614		$	444,077		$	1,275,057		$	1,358,631
Ethylene, styrene and other	108,171			251,597			669,718			587,438
Total Olefins	539,785			695,674			1,944,775			1,946,069
Vinyls
PVC, caustic soda and other	191,310			198,046			569,316			583,214
Building products	90,080			74,652			255,909			231,390
Total Vinyls	281,390			272,698			825,225			814,604
	$	821,175		$	968,372		$	2,770,000		$	2,760,673
Intersegment sales
Olefins	$	76,771		$	109,140		$	247,671		$	327,584
Vinyls	391			376			1,167			1,100
	$	77,162		$	109,516		$	248,838		$	328,684
Income (loss) from operations
Olefins	$	124,452		$	105,353		$	409,550		$	383,376
Vinyls	24,059			16,123			67,724			23,565
Corporate and other	(5,994		)	(4,145		)	(18,154		)	(10,604		)
	$	142,517		$	117,331		$	459,120		$	396,337
Depreciation and amortization
Olefins	$	27,070		$	21,746		$	74,903		$	64,998
Vinyls	11,232			10,967			34,330			32,782
Corporate and other	122			148			368			464
	$	38,424		$	32,861		$	109,601		$	98,244

15

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Other income (expense), net
Olefins	$	806		$	949		$	2,764		$	2,033
Vinyls	146			(303		)	115			179
Corporate and other	270			811			797			2,084
	$	1,222		$	1,457		$	3,676		$	4,296
Provision for (benefit from) income taxes
Olefins	$	36,092		$	34,867		$	130,612		$	128,405
Vinyls	6,556			5,277			18,989			5,847
Corporate and other	(4,412		)	(2,013		)	(3,418		)	(4,591		)
	$	38,236		$	38,131		$	146,183		$	129,661
Capital expenditures
Olefins	$	46,867		$	26,570		$	92,168		$	59,969
Vinyls	47,001			15,447			139,836			50,454
Corporate and other	1,027			628			3,459			1,400
	$	94,895		$	42,645		$	235,463		$	111,823

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Income from operations	$	142,517		$	117,331		$	459,120		$	396,337
Interest expense	(11,934		)	(12,727		)	(35,682		)	(38,449		)
Debt retirement costs	(7,082		)	—			(7,082		)	—
Gain from sales of equity securities	477			—			16,429			—
Other income, net	1,222			1,457			3,676			4,296
Income before income taxes	$	125,200		$	106,061		$	436,461		$	362,184

	September 30, 2012		December 31, 2011
Total assets
Olefins	$	1,355,157	$	1,441,752
Vinyls	956,665		824,825
Corporate and other	1,232,352		1,000,244
	$	3,544,174	$	3,266,821

15. Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

16

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

16. Guarantor Disclosures

The Company’s payment obligations under the 2022 Notes are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 2022 Notes in excess of $5,000 (the “Guarantor Subsidiaries”). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation. These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the Guarantor Subsidiaries and the remaining subsidiaries that do not guarantee the 2022 Notes (the “Non-Guarantor Subsidiaries”), together with consolidating adjustments necessary to present the Company’s results on a consolidated basis.

Condensed Consolidating Financial Information as of September 30, 2012

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	1,168,124	$	5,693	$	24,651	$	—		$	1,198,468
Accounts receivable, net	19,803		1,685,259		5,480		(1,316,950		)	393,592
Inventories	—		357,780		13,757		—			371,537
Prepaid expenses and other    current assets	292		11,253		2,927		—			14,472
Deferred income taxes	430		19,085		221		—			19,736
Total current assets	1,188,649		2,079,070		47,036		(1,316,950		)	1,997,805
Property, plant and equipment, net	—		1,386,453		7,745		—			1,394,198
Equity investments	2,910,021		53,908		33,244		(2,952,999		)	44,174
Other assets, net	17,622		106,350		1,714		(17,689		)	107,997
Total assets	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174
Current liabilities
Accounts payable	$	1,314,329	$	179,772	$	11,073	$	(1,305,736	)	$	199,438
Accrued liabilities	15,640		157,906		1,037		(11,214		)	163,369
Total current liabilities	1,329,969		337,678		12,110		(1,316,950		)	362,807
Long-term debt	752,842		10,889		11,500		(11,500		)	763,731
Deferred income taxes	—		340,197		1,386		(6,189		)	335,394
Other liabilities	53		48,704		57		—			48,814
Stockholders’ equity	2,033,428		2,888,313		64,686		(2,952,999		)	2,033,428
Total liabilities and    stockholders’ equity	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174

17

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information as of December 31, 2011

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	803,320	$	2,517	$	20,064	$	—		$	825,901
Accounts receivable, net	—		1,384,705		949		(978,282		)	407,372
Inventories	—		478,229		12,548		—			490,777
Prepaid expenses and other    current assets	363		10,332		1,800		—			12,495
Deferred income taxes	430		19,049		132		—			19,611
Total current assets	804,113		1,894,832		35,493		(978,282		)	1,756,156
Property, plant and equipment, net	—		1,223,073		8,993		—			1,232,066
Equity investments	2,597,598		53,912		35,650		(2,640,419		)	46,741
Restricted cash	96,283		—		—		—			96,283
Other assets, net	17,650		132,968		2,467		(17,510		)	135,575
Total assets	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821
Current liabilities
Accounts payable	$	1,005,529	$	210,476	$	3,748	$	(992,719	)	$	227,034
Accrued liabilities	76		120,656		2,392		14,437			137,561
Total current liabilities	1,005,605		331,132		6,140		(978,282		)	364,595
Long-term debt	753,674		10,889		11,500		(11,500		)	764,563
Deferred income taxes	—		336,165		636		(6,010		)	330,791
Other liabilities	53		50,458		49		—			50,560
Stockholders’ equity	1,756,312		2,576,141		64,278		(2,640,419		)	1,756,312
Total liabilities and    stockholders’ equity	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821

18

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	809,164		$	13,876		$	(1,865	)	$	821,175
Cost of sales	—			638,892			11,969			(1,865		)	648,996
Gross profit	—			170,272			1,907			—			172,179
Selling, general and administrative    expenses	498			27,601			1,563			—			29,662
(Loss) income from operations	(498		)	142,671			344			—			142,517
Interest expense	(11,919		)	(15		)	—			—			(11,934		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	—			477			—			—			477
Other income (expense), net	4,556			(2,744		)	(590		)	—			1,222
(Loss) income before income taxes	(14,943		)	140,389			(246		)	—			125,200
(Benefit from) provision for income taxes	(4,498		)	42,596			138			—			38,236
Equity in net income of subsidiaries	97,409			—			—			(97,409		)	—
Net income (loss)	$	86,964		$	97,793		$	(384	)	$	(97,409	)	$	86,964
Comprehensive income	$	88,666		$	98,109		$	481		$	(98,590	)	$	88,666

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	956,390	$	12,708		$	(726	)	$	968,372
Cost of sales	—			810,516		11,515			(726		)	821,305
Gross profit	—			145,874		1,193			—			147,067
Selling, general and administrative    expenses	1,125			27,242		1,369			—			29,736
(Loss) income from operations	(1,125		)	118,632		(176		)	—			117,331
Interest expense	(12,727		)	—		—			—			(12,727		)
Other income (expense), net	1,396			950		(889		)	—			1,457
(Loss) income before income taxes	(12,456		)	119,582		(1,065		)	—			106,061
(Benefit from) provision for income taxes	(4,510		)	43,190		(549		)	—			38,131
Equity in net income of subsidiaries	75,876			—		—			(75,876		)	—
Net income (loss)	$	67,930		$	76,392	$	(516	)	$	(75,876	)	$	67,930
Comprehensive income (loss)	$	60,503		$	70,019	$	(1,570	)	$	(68,449	)	$	60,503

19

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,738,180		$	37,154		$	(5,334	)	$	2,770,000
Cost of sales	—			2,197,300			31,322			(5,334		)	2,223,288
Gross profit	—			540,880			5,832			—			546,712
Selling, general and administrative    expenses	1,500			81,288			4,804			—			87,592
(Loss) income from operations	(1,500		)	459,592			1,028			—			459,120
Interest expense	(35,652		)	(30		)	—			—			(35,682		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	1			16,428			—			—			16,429
Other income (expense), net	12,044			(5,724		)	(2,644		)	—			3,676
(Loss) income before income taxes	(32,189		)	470,266			(1,616		)	—			436,461
(Benefit from) provision for income taxes	(11,105		)	158,228			(940		)	—			146,183
Equity in net income of subsidiaries	311,362			—			—			(311,362		)	—
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Comprehensive income	$	291,185		$	312,017		$	252		$	(312,269	)	$	291,185

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,731,248		$	32,331		$	(2,906	)	$	2,760,673
Cost of sales	—			2,251,296			30,537			(2,906		)	2,278,927
Gross profit	—			479,952			1,794			—			481,746
Selling, general and administrative    expenses	3,149			78,283			3,977			—			85,409
(Loss) income from operations	(3,149		)	401,669			(2,183		)	—			396,337
Interest expense	(38,403		)	(46		)	—			—			(38,449		)
Other income (expense), net	6,410			(2,090		)	(24		)	—			4,296
(Loss) income before income taxes	(35,142		)	399,533			(2,207		)	—			362,184
(Benefit from) provision for income taxes	(11,858		)	142,247			(728		)	—			129,661
Equity in net income of subsidiaries	255,807			—			—			(255,807		)	—
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Comprehensive income (loss)	$	225,981		$	251,474		$	(2,209	)	$	(249,265	)	$	225,981

20

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,149			107,191			2,410			—			110,750
Deferred income taxes	(176		)	3,932			629			—			4,385
Net changes in working capital    and other	(310,163		)	95,909			(1,898		)	311,362			95,210
Net cash (used for) provided by    operating activities	(18,912		)	519,070			465			—			500,623
Cash flows from investing activities
Additions to property, plant and    equipment	—			(234,713		)	(750		)	—			(235,463		)
Construction of assets pending    sale-leaseback	—			(5,484		)	—			—			(5,484		)
Proceeds from disposition of assets	—			414			21			—			435
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Proceeds from sales of equity securities	3			47,652			—			—			47,655
Purchase of investments	—			(2,961		)	—			—			(2,961		)
Settlements of derivative instruments	—			471			—			—			471
Net cash provided by (used for)    investing activities	3			(194,621		)	34			—			(194,584		)
Cash flows from financing activities
Intercompany financing	317,185			(321,273		)	4,088			—			—
Capitalized debt issuance costs	(2,221		)	—			—			—			(2,221		)
Dividends paid	(22,345		)	—			—			—			(22,345		)
Proceeds from borrowings	248,818			—			—			—			248,818
Proceeds from exercise of stock options	6,627			—			—			—			6,627
Repayment of borrowings	(250,000		)	—			—			—			(250,000		)
Repurchase of common stock for treasury	(10,784		)	—			—			—			(10,784		)
Utilization of restricted cash	96,433			—			—			—			96,433
Net cash provided by (used for)    financing activities	383,713			(321,273		)	4,088			—			66,528
Net increase in cash and cash equivalents	364,804			3,176			4,587			—			372,567
Cash and cash equivalents at beginning    of period	803,320			2,517			20,064			—			825,901
Cash and cash equivalents at end of period	$	1,168,124		$	5,693		$	24,651		$	—		$	1,198,468

21

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,290			95,486			2,757			—			99,533
Deferred income taxes	(1,430		)	21,010			(145		)	—			19,435
Net changes in working capital    and other	(255,859		)	(104,494		)	(2,592		)	255,807			(107,138		)
Net cash (used for) provided by    operating activities	(23,476		)	269,288			(1,459		)	—			244,353
Cash flows from investing activities
Additions to property, plant and equipment	—			(110,887		)	(936		)	—			(111,823		)
Proceeds from disposition of assets	—			2,453			3			—			2,456
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Purchase of investments	—			(29,877		)	—			—			(29,877		)
Settlements of derivative instruments	—			(331		)	—			—			(331		)
Net cash used for investing    activities	—			(138,642		)	(170		)	—			(138,812		)
Cash flows from financing activities
Intercompany financing	129,251			(129,158		)	(93		)	—			—
Capitalized debt issuance costs	(2,540		)	—			—			—			(2,540		)
Dividends paid	(13,359		)	—			—			—			(13,359		)
Proceeds from exercise of stock options	5,323			—			—			—			5,323
Repurchase of common stock for treasury	(19		)	—			—			—			(19		)
Utilization of restricted cash	33,694			—			—			—			33,694
Net cash provided by (used for)    financing activities	152,350			(129,158		)	(93		)	—			23,099
Net increase (decrease) in cash and    cash equivalents	128,874			1,488			(1,722		)	—			128,640
Cash and cash equivalents at beginning    of period	611,158			53			19,088			—			630,299
Cash and cash equivalents at end of period	$	740,032		$	1,541		$	17,366		$	—		$	758,939

22

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

This discussion and analysis should be read in conjunction with information contained in the accompanying unaudited consolidated interim financial statements of Westlake Chemical Corporation and the notes thereto and the consolidated financial statements and notes thereto of Westlake Chemical Corporation included in Westlake Chemical Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011 (the “2011 Form 10-K”). The following discussion contains forward-looking statements. Please read “Forward-Looking Statements” for a discussion of limitations inherent in such statements.

We are a vertically integrated manufacturer and marketer of petrochemicals, polymers and fabricated building products. Our two principal business segments are Olefins and Vinyls. We use the majority of our internally-produced basic chemicals to produce higher value-added chemicals and building products.

Beginning in 2009 and continuing through the third quarter of 2012, a cost advantage for ethane-based ethylene producers over naphtha-based ethylene producers allowed a strong export market and higher margins for North American chemical producers, including Westlake. Increased global demand for polyethylene since 2010 has resulted in increased sales volumes and improved operating margins and cash flow for our Olefins segment. However, some olefins industry consultants predict that increases in worldwide ethylene and ethylene derivative capacity, which have occurred over the past four years, primarily in the Middle East and Asia, may continue. As a result, our Olefins segment operating margins may be negatively impacted.

Weakness in the U.S. construction markets, which began in the third quarter of 2006, and the subsequent budgetary constraints in municipal spending, have contributed to lower domestic demand for our vinyls products. In addition, increases in feedstock costs, combined with the industry’s inability to sufficiently raise domestic prices for PVC resin and building products in order to offset cost increases, impacted our Vinyls segment’s operating results in 2010 and 2011. However, since late 2010, the PVC industry has also experienced an increase in PVC resin export demand, driven largely by more competitive feedstock and energy cost positions in North America. As a consequence, domestic PVC resin industry operating rates improved due to higher PVC resin export shipments. Looking forward, our Vinyls segment operating rates and margins may continue to be negatively impacted by the slow recovery of U.S. construction markets.

While the economic environment continues to be challenging for our customers, we believe our customer base remains generally healthy. As we continue to manage our business in this environment, including the slowdown in construction activity, we have taken steps designed to address the changes in demand and margins in our Vinyls segment and its resulting impact on our operations by matching production with sales demand and continuing to operate our plants in an efficient manner. We continue to monitor our cost management programs and discretionary capital spending. The impact of the global economic environment has been challenging to our business and, depending on the performance of the economy in the remainder of 2012 and beyond, could have a negative effect on our financial condition, results of operations or cash flows.

Recent Developments

In October 2012, we announced that we were converting the feedstock for our Calvert City, Kentucky ethylene plant from propane to ethane and increasing ethylene capacity from 450 million pounds annually to 630 million pounds annually. This expansion and feedstock conversion is expected to enhance our vinyl chain integration and leverage low cost ethane being developed in the Marcellus shale area. The ethylene expansion and feedstock conversion project is targeted for start-up in the second quarter of 2014. In addition, we announced an expansion of the existing PVC plant in Calvert City, which should allow us to take advantage of the increased ethylene production at our Calvert City complex and to provide additional PVC resin to meet the growing demands of our global customers. The expansion of the PVC plant is expected to increase PVC resin capacity by approximately 200 million pounds annually and is targeted for completion by late 2014.

In September 2012, we completed planned major maintenance activities, or turnaround, of the styrene plant at our Lake Charles, Louisiana complex. The unit was restarted after 87 days. Income from operations for the third quarter of 2012 was negatively impacted as a result of the unabsorbed fixed manufacturing costs related to the turnaround.

We previously announced an expansion program to increase the ethane-based ethylene capacity of both of the ethylene units at our Lake Charles complex. In September 2012, we announced that we expect to complete the expansion of one of the two ethylene units by the first quarter of 2013. The first cracker expansion is expected to increase ethylene capacity by approximately 230 - 240 million pounds annually, while also increasing feedstock flexibility. The additional capacity from this expansion is expected to provide ethylene for existing internal uses and may also be sold in the merchant market. We expect this project will be funded with cash on hand, cash flow from operations, and, if necessary, our revolving credit facility and other external financing. In addition, we are currently evaluating expansion plans to increase the ethane-based ethylene capacity of the second ethylene unit at our Lake Charles complex.

23

On July 17, 2012, we issued $250.0 million aggregate principal amount of 3.60% senior notes due 2022 (the “2022 Notes”). On July 30, 2012, we voluntarily redeemed all $250.0 million aggregate principal amount of our outstanding 6 ⁵/8% senior notes due 2016 (the “2016 Notes”), at a redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. We used the net proceeds from the issuance of the 2022 Notes, plus cash on hand, to pay the redemption price of the 2016 Notes. As a result of the early redemption of the 2016 Notes, we recognized $7.1 million in non-operating expense in the third quarter of 2012 consisting primarily of a pre-payment premium of $5.5 million and a write-off of $1.3 million in previously capitalized debt issuance costs.

Results of Operations

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(dollars in thousands)
Net external sales
Olefins
Polyethylene	$	431,614		$	444,077		$	1,275,057		$	1,358,631
Ethylene, styrene and other	108,171			251,597			669,718			587,438
Total Olefins	539,785			695,674			1,944,775			1,946,069
Vinyls
PVC, caustic soda and other	191,310			198,046			569,316			583,214
Building products	90,080			74,652			255,909			231,390
Total Vinyls	281,390			272,698			825,225			814,604
Total	$	821,175		$	968,372		$	2,770,000		$	2,760,673
	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(dollars in thousands)
Income (loss) from operations
Olefins	$	124,452		$	105,353		$	409,550		$	383,376
Vinyls	24,059			16,123			67,724			23,565
Corporate and other	(5,994		)	(4,145		)	(18,154		)	(10,604		)
Total income from operations	142,517			117,331			459,120			396,337
Interest expense	(11,934		)	(12,727		)	(35,682		)	(38,449		)
Debt retirement costs	(7,082		)	—			(7,082		)	—
Gain from sales of equity securities	477			—			16,429			—
Other income, net	1,222			1,457			3,676			4,296
Provision for income taxes	38,236			38,131			146,183			129,661
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Diluted earnings per share	$	1.30		$	1.01		$	4.33		$	3.48
	Three Months Ended September 30, 2012						Nine Months Ended September 30, 2012
	Average Sales Price			Volume			Average Sales Price			Volume
Product sales price and volume percentage change    from prior year period
Olefins	(14.4		)%	(8.1		)%	(9.8		)%	9.8		%
Vinyls	(19.4		)%	22.6		%	(4.5		)%	5.8		%
Company average	(15.8		)%	0.6		%	(8.3		)%	8.6		%

24

	Three Months Ended September 30,		Nine Months Ended September 30,
	2012	2011	2012	2011
Average industry prices (1)
Ethane (cents/lb)	11.4	26.3	14.6	24.8
Propane (cents/lb)	21.2	36.4	24.7	34.7
Ethylene (cents/lb) (2)	52.1	60.4	57.8	57.5
Polyethylene (cents/lb) (3)	91.3	96.0	95.1	98.8
Styrene (cents/lb) (4)	77.7	73.3	75.3	74.5
Caustic soda ($/short ton) (5)	611.7	570.0	598.3	525.6
Chlorine ($/short ton) (6)	262.5	348.3	268.1	338.3
PVC (cents/lb) (7)	52.5	55.0	54.8	52.1

_____________

(1) Industry pricing data was obtained through IHS Chemical. We have not independently verified the data.

(2) Represents average North American spot prices of ethylene over the period as reported by IHS Chemical.

(3) Represents average North American contract prices of polyethylene low density film over the period as reported by IHS Chemical.

(4) Represents average North American contract prices of styrene over the period as reported by IHS Chemical.

(5) Represents average North American acquisition prices of caustic soda (diaphragm grade) over the period as reported by IHS Chemical.

(6) Represents average North American contract prices of chlorine (into chemicals) over the period as reported by IHS Chemical.

(7) Represents average North American contract prices of PVC over the period as reported by IHS Chemical. During the first quarter of 2012, IHS Chemical made a 23 cents per pound non-market downward adjustment to PVC resin prices. For comparability, we adjusted both prior year periods’ PVC resin price downward by 23 cents per pound consistent with the IHS Chemical non-market adjustment.

Summary

For the quarter ended September 30, 2012, net income was $87.0 million, or $1.30 per diluted share, on net sales of $821.2 million. This represents an increase in net income of $19.1 million, or $0.29 per diluted share, over the quarter ended September 30, 2011 net income of $67.9 million, or $1.01 per diluted share, on net sales of $968.4 million. Income before income taxes for the third quarter of 2012 was negatively impacted by $17.6 million related to debt retirement costs ($7.1 million) and the unabsorbed fixed manufacturing costs associated with a planned outage of our styrene plant in Lake Charles ($10.5 million). Net sales for the third quarter of 2012 decreased by $147.2 million compared to net sales for the third quarter of 2011, mainly attributable to lower sales prices for most of our major products and lower sales volume for styrene, partially offset by higher polyethylene, ethylene, PVC resin and building products sales volumes. Income from operations was $142.5 million for the third quarter of 2012 as compared to $117.3 million for the third quarter of 2011. Income from operations for the third quarter of 2012 benefited primarily from improved olefins and vinyls integrated product margins predominantly due to lower feedstock and energy costs, higher sales volumes for polyethylene and our major vinyls products and higher operating rates as compared to the prior year period. Industry ethane prices declined 56.7% and industry propane prices declined 41.8% in the third quarter of 2012 as compared to the third quarter of 2011.

For the nine months ended September 30, 2012, net income was $290.3 million, or $4.33 per diluted share, on net sales of $2,770.0 million. This represents an increase in net income of $57.8 million, or $0.85 per diluted share, from the nine months ended September 30, 2011 net income of $232.5 million, or $3.48 per diluted share, on net sales of $2,760.7 million. Net sales for the nine months ended September 30, 2012 increased marginally by $9.3 million compared to the prior year period mainly due to higher ethylene and feedstock sales volumes, mostly offset by lower sales prices for most of our major products. Income from operations was $459.1 million for the nine months ended September 30, 2012 as compared to $396.3 million for the nine months ended September 30, 2011. The increase in income from operations was primarily attributable to higher vinyls and olefins integrated product margins as compared to the prior year period. The improved margins were predominantly due to a significant decrease in feedstock costs as industry ethane prices decreased 41.1% and industry propane prices decreased 28.8%. Income from operations for the nine months ended September 30, 2011 was negatively impacted by a number of factors, including an unscheduled outage at one of our ethylene units in Lake Charles caused by a weather related power supply failure from a third party power provider, the turnaround of our Calvert City facility, the closure of our

25

Springfield, Kentucky PVC pipe production facility and higher operating costs resulting from a reduction in our ethylene operating rates in Lake Charles in the first quarter of 2011 due to a fire at a third party storage facility in Mont Belvieu, Texas.

RESULTS OF OPERATIONS

Third Quarter 2012 Compared with Third Quarter 2011

Net Sales. Net sales decreased by $147.2 million, or 15.2%, to $821.2 million in the third quarter of 2012 from $968.4 million in the third quarter of 2011, primarily attributable to lower sales prices for most of our major products and lower sales volumes for styrene, partially offset by higher polyethylene, ethylene, PVC resin and building products sales volumes. Average sales prices for the third quarter of 2012 decreased by 15.8% as compared to the third quarter of 2011. Overall sales volume increased marginally by 0.6% as compared to the third quarter of 2011.

Gross Profit. Gross profit margin percentage increased to 21.0% for the third quarter of 2012 from 15.2% for the third quarter of 2011, driven mainly by improved olefins and vinyls integrated product margins attributable to lower feedstock and energy costs. The third quarter 2012 gross profit margin percentage also benefited from higher sales volume for our major vinyls products and higher operating rates. Our raw material cost in both segments normally tracks industry prices, which experienced a decrease of 56.7% and 41.8% for ethane and propane, respectively, as compared to the third quarter of 2011. Sales prices decreased an average of 15.8% for the third quarter of 2012 as compared to the third quarter of 2011.

Selling, General and Administrative Expenses. Selling, general and administrative expenses for the third quarter of 2012 of $29.7 million were comparable to the prior year period amount of $29.7 million as an increase in payroll and related labor costs, including incentive compensation, were largely offset by decreases in consulting fees and the facility fee for our senior secured revolving credit facility.

Interest Expense. Interest expense decreased by $0.8 million to $11.9 million in the third quarter of 2012 from $12.7 million in the third quarter of 2011 largely as a result of lower interest rates for the 2022 Notes as compared to the 2016 Notes. Debt balances remained relatively unchanged from the prior year period.

Debt Retirement Costs. We recognized $7.1 million in non-operating expense in the third quarter of 2012 consisting primarily of a pre-payment premium of $5.5 million and a write-off of $1.3 million in previously capitalized debt issuance costs as a result of the early redemption of the 2016 Notes.

Gain from Sales of Equity Securities. We completed the liquidation of our holdings of available-for-sale securities in the third quarter of 2012. As a result of the disposition, we recognized a gain of $0.5 million in non-operating income in the third quarter of 2012.

Other Income, Net. Other income, net decreased to $1.2 million in the third quarter of 2012 from $1.5 million in the third quarter of 2011, mainly due to lower equity in income from our joint ventures, partially offset by higher interest income attributable to higher average cash balances in the third quarter of 2012.

Income Taxes. The effective income tax rate was 30.5% for the third quarter of 2012. The effective income tax rate for the third quarter of 2012 was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits, the domestic manufacturing deduction and a reduction in state income taxes. The effective income tax rate was 36.0% for the third quarter of 2011. The effective income tax rate for the third quarter of 2011 was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

Olefins Segment

Net Sales. Net sales decreased by $155.9 million, or 22.4%, to $539.8 million in the third quarter of 2012 from $695.7 million in the third quarter of 2011, predominantly due to lower sales prices for most of our major products, partially offset by higher polyethylene and ethylene sales volumes as compared to the prior year period. In addition, styrene sales volume was negatively impacted by the turnaround of the styrene plant in Lake Charles, which was down for most of the third quarter of 2012. Average sales prices for the Olefins segment decreased by 14.4% in the third quarter of 2012 as compared to the third quarter of 2011. Average sales volumes decreased by 8.1% in the third quarter of 2012 as compared to the third quarter of 2011.

Income from Operations. Income from operations increased by $19.1 million, or 18.1%, to $124.5 million in the third quarter of 2012 from $105.4 million in the third quarter of 2011. This increase was mainly attributable to higher olefins integrated product margins as compared to the prior year period. Margins improved primarily as a result of significantly lower feedstock and energy costs, which were only partially offset by lower sales prices. Third quarter 2012 income from operations was negatively impacted by the lost production, as well as the expensing of $10.5 million related to the unabsorbed fixed

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manufacturing costs from the scheduled shut down of the styrene plant in Lake Charles. Trading activity in the third quarter of 2012 resulted in a gain of $0.2 million as compared to a gain of $0.4 million in the third quarter of 2011.

Vinyls Segment

Net Sales. Net sales increased by $8.7 million, or 3.2%, to $281.4 million in the third quarter of 2012 from $272.7 million in the third quarter of 2011. This increase was mainly attributable to higher sales volumes for all major products, partially offset by lower sales prices for all major products. Average sales prices for the Vinyls segment decreased by 19.4% in the third quarter of 2012 as compared to the third quarter of 2011. Average sales volumes for the Vinyls segment increased by 22.6% in the third quarter of 2012 as compared to the third quarter of 2011.

Income from Operations. Income from operations increased by $8.0 million, or 49.7%, to $24.1 million in the third quarter of 2012 from $16.1 million in the third quarter of 2011. This increase was primarily driven by lower feedstock costs, improved building products margin and higher operating rates as compared to the prior year period. While operating results for the third quarter of 2012 improved compared to the third quarter of 2011, our Vinyls segment continued to be negatively impacted by weakness in the U.S. construction markets and budgetary constraints in municipal spending.

Nine Months Ended September 30, 2012 Compared with Nine Months Ended September 30, 2011

Net Sales. Net sales increased marginally by $9.3 million, or 0.3%, to $2,770.0 million for the first nine months of 2012 from $2,760.7 million for the first nine months of 2011, primarily driven by higher ethylene and feedstock sales volumes, mostly offset by lower sales prices for most of our major products. Average sales prices for the first nine months of 2012 decreased by 8.3% as compared to the first nine months of 2011. Overall sales volume increased by 8.6% as compared to the first nine months of 2011.

Gross Profit. Gross profit margin percentage of 19.7% for the nine months ended September 30, 2012 increased from the 17.4% gross profit margin percentage for the nine months ended September 30, 2011. The improvement in gross profit margin percentage was predominantly due to lower feedstock and energy costs. Our raw material cost in both segments normally tracks industry prices, which experienced a decrease of 41.1% and 28.8% for ethane and propane, respectively, as compared to the nine months ended September 30, 2011. Sales prices decreased an average of 8.3% for the nine months ended September 30, 2012 as compared to the prior year period.

Selling, General and Administrative Expenses. Selling, general and administrative expenses for the nine months ended September 30, 2012 increased by $2.2 million as compared to the nine months ended September 30, 2011 mainly attributable to expenses associated with our terminated proposal to acquire Georgia Gulf Corporation (“Georgia Gulf”) and an increase in payroll and related labor costs, including incentive compensation, partially offset by decreases in consulting fees and the facility fee for our senior secured revolving credit facility.

Interest Expense. Interest expense decreased by $2.7 million to $35.7 million in the first nine months of 2012, largely due to increased capitalized interest on major capital projects in the first nine months of 2012 and lower interest rates for the 2022 Notes as compared to the 2016 Notes. Debt balances remained relatively unchanged from the prior year period.

Debt Retirement Costs. We recognized $7.1 million in non-operating expense in the first nine months of 2012 consisting primarily of a pre-payment premium of $5.5 million and a write-off of $1.3 million in previously capitalized debt issuance costs as a result of the early redemption of the 2016 Notes.

Gain from Sales of Equity Securities. We liquidated our holdings of available-for-sale securities in the second and third quarters of 2012. As a result of the disposition, we recognized a gain of $16.4 million in non-operating income in the first nine months of 2012.

Other Income, Net. Other income, net decreased by $0.6 million to $3.7 million in the first nine months of 2012 from $4.3 million in the first nine months of 2011 as lower equity in income from our joint ventures was mostly offset by higher interest income attributable to higher average cash balances in the first nine months of 2012.

Income Taxes. The effective income tax rate was 33.5% for the nine months ended September 30, 2012. The effective income tax rate for the 2012 period was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, partially offset by state income taxes. The effective income tax rate was 35.8% for the nine months ended September 30, 2011. The effective income tax rate for the 2011 period was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

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Olefins Segment

Net Sales. Net sales for the nine months ended September 30, 2012 of $1,944.8 million were comparable to net sales for the nine months ended September 30, 2011 of $1,946.1 million as higher ethylene and feedstock sales volumes were offset by lower sales prices for all of our major products. Average sales prices for the Olefins segment decreased by 9.8% in the first nine months of 2012 as compared to the first nine months of 2011. Average sales volumes increased by 9.8% in the first nine months of 2012 as compared to the first nine months of 2011.

Income from Operations. Income from operations increased by $26.2 million, or 6.8%, to $409.6 million in the first nine months of 2012 from $383.4 million in the first nine months of 2011. This increase was mainly attributable to higher olefins integrated product margins as compared to the prior year period. Margins improved as a result of lower feedstock and energy costs, which were only partially offset by lower sales prices. Income from operations for the first nine months of 2012 was negatively impacted by the unabsorbed fixed manufacturing costs from the scheduled shut down of the styrene plant in Lake Charles. Trading activity for the nine months ended September 30, 2012 resulted in a loss of $0.8 million as compared to a gain of $0.8 million for the prior year period. The first nine months of 2011 were negatively impacted by lost ethylene production, repair costs and unabsorbed fixed manufacturing costs incurred in connection with the unscheduled outage at one of our ethylene units in Lake Charles and the fire at a third party storage facility at Mont Belvieu.

Vinyls Segment

Net Sales. Net sales increased by $10.6 million, or 1.3%, to $825.2 million for the nine months ended September 30, 2012 from $814.6 million for the nine months ended September 30, 2011. This increase was primarily attributable to higher building products and caustic sales prices and sales volumes, partially offset by lower PVC resin sales prices as compared to the prior year period. Average sales prices for the Vinyls segment decreased by 4.5% in the first nine months of 2012 as compared to the first nine months of 2011, while average sales volumes increased by 5.8%.

Income from Operations. Income from operations increased by $44.1 million to $67.7 million for the nine months ended September 30, 2012 from $23.6 million for the nine months ended September 30, 2011. This increase was predominantly driven by lower feedstock and energy costs and higher caustic and building products sales volumes as compared to the prior year period. The 2012 period income from operations was negatively impacted by an unscheduled shut down of our Geismar, Louisiana vinyls complex and lower operating rates at that complex as a result of operational issues related to a fire at the complex in March 2012. We expensed approximately $11.0 million of costs associated with that event in the first nine months of 2012. The Vinyls segment’s operating results for the first nine months of 2011 were negatively impacted by the turnaround at the Calvert City facility and the closure of the Springfield PVC pipe facility.

CASH FLOW DISCUSSION FOR NINE MONTHS ENDED SEPTEMBER 30, 2012 AND 2011

Cash Flows

Operating Activities

Operating activities provided cash of $500.6 million in the first nine months of 2012 compared to cash provided of $244.4 million in the first nine months of 2011. The $256.2 million increase in cash flows from operating activities was mainly due to an increase in income from operations and a decrease in working capital requirements, as compared to the prior year period. Income from operations increased by $62.8 million in the first nine months of 2012 primarily as a result of higher vinyls and olefins integrated product margins as compared to the prior year period. Changes in components of working capital, which we define for purposes of this cash flow discussion as accounts receivable, net, inventories, prepaid expenses and other current assets, less accounts payable and accrued liabilities, provided cash of $115.3 million in the first nine months of 2012, compared to $108.0 million of cash used in the first nine months of 2011, a favorable change of $223.3 million. This change was mainly due to a decrease in inventory and accounts receivable during the 2012 period primarily attributable to lower feedstock costs and lower average sales prices.

Investing Activities

Net cash used for investing activities during the first nine months of 2012 was $194.6 million as compared to net cash used for investing activities of $138.8 million in the first nine months of 2011. Capital expenditures were $235.5 million in the first nine months of 2012 compared to $111.8 million in the first nine months of 2011. The higher capital expenditures in the 2012 period were largely attributable to capital expenditures incurred on the construction of the new chlor-alkali plant at our Geismar facility, the expansion of the ethylene unit at our Lake Charles complex and the modernization of the ethylene furnaces at our Calvert City complex. The remaining capital expenditures in the first nine months of 2012 and capital expenditures in the first nine months of 2011 primarily related to projects to improve production capacity or reduce costs and safety and environmental projects at our various facilities. Construction of assets pending sale-leaseback totaled $5.5 million in

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the first nine months of 2012 and pertained to the construction of transportation equipment. Purchases of equity securities in the first nine months of 2012 totaled $3.0 million and comprised of shares of Georgia Gulf common stock. We received aggregate proceeds of $47.7 million from the sale of all our available-for-sale equity securities during the first nine months of 2012. The 2011 period activity was primarily related to the $29.9 million purchase of these equity securities.

Financing Activities

Net cash provided by financing activities during the first nine months of 2012 was $66.5 million as compared to net cash provided of $23.1 million in the first nine months of 2011. The 2012 period activity was primarily related to proceeds of $248.8 million from the issuance of the 2022 Notes, which was offset by the optional redemption of $250.0 million of 2016 Notes. In addition, we received proceeds of $6.6 million from the exercise of stock options and a $96.4 million draw-down of our restricted cash for use for eligible capital expenditures in the 2012 period. As of September 30, 2012, we had drawn down all of our restricted cash. Net cash provided by financing activities was partially offset by the $10.8 million of repurchases of shares of our common stock, the $22.3 million payment of cash dividends and $2.2 million of debt issuance costs associated with the issuance of the 2022 Notes. The 2011 period activity was mainly related to the draw-down of our restricted cash and proceeds from the exercise of stock options, partially offset by the $13.4 million payment of cash dividends.

LIQUIDITY AND CAPITAL RESOURCES

Liquidity and Financing Arrangements

Our principal sources of liquidity are from cash and cash equivalents, cash from operations, short-term borrowings under our revolving credit facility and our long-term financing. As we continue to manage our business through the current economic environment, we have maintained our focus on cost control and various initiatives designed to preserve cash and liquidity.

In October 2012, we announced that we were converting the feedstock for our Calvert City ethylene plant from propane to ethane and increasing ethylene capacity from 450 million pounds annually to 630 million pounds annually. The ethylene expansion and feedstock conversion project is targeted for start-up in the second quarter of 2014. In addition, we announced an expansion of the existing PVC plant in Calvert City, which should allow us to take advantage of the increased ethylene production at our Calvert City complex and to provide additional PVC resin to meet the growing demands of our global customers. The expansion of the PVC plant is expected to increase PVC resin capacity by approximately 200 million pounds annually and is targeted for completion by late 2014. These projects are currently estimated to cost in the range of $210.0 million to $240.0 million. Further, in December 2011, we announced plans to perform a major modernization of the ethylene furnaces at our Calvert City complex. We currently expect the modernization to be completed by mid-2013. This capital project is currently estimated to cost approximately $40.0 million.

In April 2011, we announced an expansion program to increase the ethane-based ethylene capacity of both of the ethylene units at our Lake Charles complex. We currently expect to complete the expansion of one of the two ethylene units by the first quarter of 2013. This expansion is currently estimated to cost in the range of $110.0 million to $145.0 million. The additional capacity from this expansion is expected to provide ethylene for existing internal uses and may also be sold in the merchant market.

In August 2010, we announced that we intend to proceed with the previously announced plans for the construction of a new chlor-alkali plant at our Geismar facility. The project is currently estimated to cost in the range of $370.0 million to $420.0 million and is targeted for start-up in the second half of 2013.

These projects are expected to be funded with cash on hand, cash flow from operations, and, if necessary, our revolving credit facility and other external financing. As of September 30, 2012, we had incurred a total cost of approximately $231.3 million on these capital projects.

In August 2011, our Board of Directors authorized a stock repurchase program totaling $100.0 million. As of September 30, 2012, we had repurchased 284,493 shares of our common stock for an aggregate purchase price of approximately $13.3 million under this program. We did not repurchase any shares under this program during the three months ended September 30, 2012. Purchases under this program may be made either through the open market or in privately negotiated transactions. Decisions regarding the amount and the timing of purchases under the program will be influenced by our cash on hand, our cash flow from operations, general market conditions and other factors. The program may be discontinued by our Board of Directors at any time.

We believe that our sources of liquidity as described above will be adequate to fund our normal operations and ongoing capital expenditures. Funding of any potential large expansions or any potential acquisitions may depend on our ability to obtain additional financing in the future. We may not be able to access additional liquidity at cost effective interest rates due to the volatility of the commercial credit markets. At September 30, 2012, the borrowing base of our credit facility was $382.1

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million, which is below the maximum borrowing capacity of $400.0 million due to our low carrying amounts of accounts receivable and inventory, which make up the borrowing base.

Cash and Restricted Cash

Total cash balances were $1,198.5 million at September 30, 2012, which was comprised of cash and cash equivalents. We had no restricted cash balance at September 30, 2012. In addition, we have a revolving credit facility available to supplement cash if needed, as described under “Debt” below.

Debt

As of September 30, 2012, our long-term debt, including current maturities, totaled $763.7 million, consisting of $250.0 million principal amount of 2022 Notes (less the unamortized discount of $1.2 million), $100.0 million of 6 ½% senior notes due 2029, $250.0 million of 6 ¾% senior notes due 2032, $89.0 million of 6 ½% senior notes due 2035 (the “6 ½% GO Zone Senior Notes Due 2035”), $65.0 million of 6 ½% senior notes due 2035 (the “6 ½% IKE Zone Senior Notes Due 2035”) (collectively but excluding the 2022 Notes, the “Senior Notes”) and a $10.9 million loan from the proceeds of tax-exempt waste disposal revenue bonds (supported by an $11.3 million letter of credit). The 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% GO Zone Senior Notes Due 2035 and the 6 ½% IKE Zone Senior Notes Due 2035 evidence and secure our obligations to the Louisiana Local Government Environmental Facility and Development Authority (the “Authority”), a political subdivision of the State of Louisiana, under four loan agreements relating to the issuance of $100.0 million, $250.0 million, $89.0 million and $65.0 million aggregate principal amount of the Authority’s tax-exempt revenue bonds, respectively. As of September 30, 2012, debt outstanding under the tax-exempt waste disposal revenue bonds bore interest at a variable rate. As of September 30, 2012, we were in compliance with all of the covenants with respect to the 2022 Notes, the Senior Notes, our waste disposal revenue bonds and our revolving credit facility.

Revolving Credit Facility

We have a $400.0 million senior secured revolving credit facility. The facility includes a provision permitting us to increase the size of the facility, up to four times, in increments of at least $25.0 million each (up to a maximum of $150.0 million) under certain circumstances if certain lenders agree to commit to such an increase.

At September 30, 2012, we had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of September 30, 2012, we had outstanding letters of credit totaling $16.2 million and borrowing availability of $365.9 million under the revolving credit facility.

Our revolving credit facility requires us to maintain a minimum fixed charge coverage ratio of 1.0:1 for successive 30-day periods after any date on which the borrowing availability under the facility is less than the greater of (1) 12.5% of the commitments under the facility and (2) $50.0 million, until the borrowing availability exceeds the greater of the amount in clause (1) and the amount in clause (2) for a 30-day period.

In order to make acquisitions or investments, our revolving credit facility provides that (1) we must maintain a minimum borrowing availability of at least the greater of $100.0 million or 25% of the total bank commitments under our revolving credit facility or (2) we must maintain a minimum borrowing availability of at least the greater of $70.0 million or 17.5% of the total bank commitments under our revolving credit facility and meet a minimum fixed charge coverage ratio of 1.0:1 under our revolving credit facility. However, we may make specified distributions up to an aggregate of $25.0 million and specified acquisitions up to an aggregate of $25.0 million if either we maintain a minimum borrowing availability of at least the greater of $70.0 million or 17.5% of the total bank commitments under our revolving credit facility or we meet the minimum fixed charge coverage ratio of 1.0:1 under our revolving credit facility. Notwithstanding the foregoing, we may make (1) investments up to $200.0 million in one or more joint ventures that own feedstock, raw material and ethylene pipeline, storage and fractionating facilities and (2) additional investments up to $55.0 million in Suzhou Huasu Plastics Co., Ltd. The revolving credit facility contains other customary covenants and events of default that impose significant operating and financial restrictions on us. These restrictions, among other things, provide limitations on the occurrence of additional indebtedness and our ability to create liens, to engage in certain affiliate transactions and to engage in sale-leaseback transactions. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources - Debt” in the 2011 Form 10-K for more information on the revolving credit facility.

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GO Zone and IKE Zone Bonds

As of September 30, 2012, we had drawn all the proceeds from the issuance of the 6 ½% senior notes due 2029, 6 ¾% senior notes due 2032, 6 ½% GO Zone Senior Notes Due 2035 and 6 ½% IKE Zone Senior Notes Due 2035. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources - Debt” in the 2011 Form 10-K for more information on the 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% GO Zone Senior Notes Due 2035 and the 6 ½% IKE Zone Senior Notes Due 2035. All domestic restricted subsidiaries that guarantee other debt of ours or of another guarantor of the Senior Notes in excess of $5.0 million are guarantors of these notes.

The indentures governing the Senior Notes contain customary covenants and events of default. Accordingly, these agreements generally impose significant operating and financial restrictions on us. These restrictions, among other things, provide limitations on incurrence of additional indebtedness, the payment of dividends, certain investments and acquisitions and sales of assets. However, the effectiveness of certain of these restrictions is currently suspended because the Senior Notes are currently rated investment grade by at least two nationally recognized credit rating agencies. The most significant of these provisions, if it were currently effective, would restrict us from incurring additional debt, except specified permitted debt (including borrowings under our credit facility), when our fixed charge coverage ratio is below 2.0:1. These limitations are subject to a number of important qualifications and exceptions, including, without limitation, an exception for the payment of our regular quarterly dividend of up to $0.20 per share (currently $0.1875 per share). If the restrictions were currently effective, distributions in excess of $100.0 million would not be allowed unless, after giving pro forma effect to the distribution, our fixed charge coverage ratio is at least 2.0:1 and such payment, together with the aggregate amount of all other distributions after January 13, 2006, is less than the sum of 50% of our consolidated net income for the period from October 1, 2003 to the end of the most recent quarter for which financial statements have been filed, plus 100% of net cash proceeds received after October 1, 2003 as a contribution to our common equity capital or from the issuance or sale of certain securities, plus several other adjustments.

3.60% Senior Notes due 2022 and 6 ⁵/8% Senior Notes due 2016

On July 17, 2012, we issued $250.0 million aggregate principal amount of the 2022 Notes, the net proceeds of which, together with cash on hand, were used, on July 30, 2012 to redeem all $250.0 million principal amount of the 2016 Notes, at the redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. As a result of the early redemption of the 2016 Notes, we recognized $7.1 million in non-operating expense in the third quarter of 2012 consisting primarily of a pre-payment premium of $5.5 million and a write-off of $1.3 million in previously capitalized debt issuance costs.

The 2022 Notes are unsecured and were issued with an original issue discount of $1.2 million. There is no sinking fund and no scheduled amortization of the 2022 Notes prior to maturity. We may optionally redeem the 2022 Notes at any time and from time to time prior to April 15, 2022 (three months prior to the maturity date) for 100% of the principal plus accrued interest and a discounted "make whole" payment of remaining unpaid principal and interest payments. On or after April 15, 2022, we may optionally redeem the 2022 Notes for 100% of the principal plus accrued interest. The holders of the 2022 Notes may require us to repurchase the 2022 Notes at a price of 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase, upon the occurrence of both a “change of control” and, within 60 days of such change of control, a “below investment grade rating event” (as such terms are defined in the indenture governing the 2022 Notes). All of our domestic subsidiaries that guarantee other indebtedness of ours or of another guarantor of the 2022 Notes in excess of $5.0 million are guarantors of the 2022 Notes.

The indenture governing the 2022 Notes contains customary events of default and covenants that will restrict our and certain of our subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of our assets.

Revenue Bonds

In December 1997, we entered into a loan agreement with a public trust established for public purposes for the benefit of the Parish of Calcasieu, Louisiana. The public trust issued $10.9 million principal amount of tax-exempt waste disposal revenue bonds in order to finance our construction of waste disposal facilities for an ethylene plant. The waste disposal revenue bonds expire in December 2027 and are subject to redemption and mandatory tender for purchase prior to maturity under certain conditions. Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent and is payable quarterly.

Our ability to make payments on our indebtedness and to fund planned capital expenditures will depend on our ability to generate cash in the future, which is subject to general economic, financial, competitive, legislative, regulatory and other

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factors that are beyond our control. Based on our current level of operations, we believe our cash flow from operations, available cash and available borrowings under our revolving credit facility will be adequate to meet our normal operating needs for the foreseeable future.

Off-Balance Sheet Arrangements

None.

FORWARD-LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 provides safe harbor provisions for forward-looking information. Certain of the statements contained in this report are forward-looking statements. All statements, other than statements of historical facts, included in this report that address activities, events or developments that we expect, project, believe or anticipate will or may occur in the future are forward-looking statements. Forward-looking statements can be identified by the use of words such as “believes,” “intends,” “may,” “should,” “could,” “anticipates,” “expected” or comparable terminology, or by discussions of strategies or trends. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we cannot give any assurances that these expectations will prove to be correct. Forward-looking statements relate to matters such as:

• future operating rates, margins, cash flow and demand for our products;

• industry market outlook;

• production capacities;

• our ability to borrow additional funds under our credit facility;

• our ability to meet our liquidity needs;

• our intended quarterly dividends;

• future capacity additions and expansions in the industry;

• timing, funding and results of the expansion and feedstock conversion programs at our Lake Charles and Calvert City complexes;

• timing, funding and results of the planned new chlor-alkali plant in Geismar;

• health of our customer base;

• pension plan funding requirements and investment policies;

• compliance with present and future environmental regulations and costs associated with environmentally related penalties, capital expenditures, remedial actions and proceedings, including any new laws, regulations or treaties that may come into force to limit or control carbon dioxide and other greenhouse gases emissions or to address other issues of climate change;

• the utilization of net operating loss carryforwards;

• effects of pending legal proceedings; and

• timing of and amount of capital expenditures.

We have based these statements on assumptions and analyses in light of our experience and perception of historical trends, current conditions, expected future developments and other factors we believe were appropriate in the circumstances when the statements were made. Forward-looking statements by their nature involve substantial risks and uncertainties that could significantly impact expected results, and actual future results could differ materially from those described in such statements. These statements are subject to a number of assumptions, risks and uncertainties, including those described in “Risk Factors” in the 2011 Form 10-K and the following:

• general economic and business conditions;

• the cyclical nature of the chemical industry;

• the availability, cost and volatility of raw materials and energy;

• uncertainties associated with the United States and worldwide economies, including those due to the global economic slowdown and political tensions in the Middle East and elsewhere;

• current and potential governmental regulatory actions in the United States and regulatory actions and political unrest in other countries;

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• industry production capacity and operating rates;

• the supply/demand balance for our products;

• competitive products and pricing pressures;

• instability in the credit and financial markets;

• access to capital markets;

• terrorist acts;

• operating interruptions (including leaks, explosions, fires, weather-related incidents, mechanical failure, unscheduled downtime, labor difficulties, transportation interruptions, spills and releases and other environmental risks);

• changes in laws or regulations;

• technological developments;

• our ability to implement our business strategies; and

• creditworthiness of our customers.

Many of these factors are beyond our ability to control or predict. Any of the factors, or a combination of these factors, could materially affect our future results of operations and the ultimate accuracy of the forward-looking statements. These forward-looking statements are not guarantees of our future performance, and our actual results and future developments may differ materially from those projected in the forward-looking statements. Management cautions against putting undue reliance on forward-looking statements or projecting any future results based on such statements or present or prior earnings levels. Every forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Commodity Price Risk

A substantial portion of our products and raw materials are commodities whose prices fluctuate as market supply and demand fundamentals change. Accordingly, product margins and the level of our profitability tend to fluctuate with changes in the business cycle. We try to protect against such instability through various business strategies. Our strategies include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. We use derivative instruments in certain instances to reduce price volatility risk on feedstocks and products. Based on our open derivative positions at September 30, 2012, a hypothetical $0.10 increase in the price of a gallon of ethane would have increased our income before taxes by $1.3 million. Additional information concerning derivative commodity instruments appears in Notes 8 and 9 to the consolidated financial statements.

Interest Rate Risk

We are exposed to interest rate risk with respect to fixed and variable rate debt. At September 30, 2012, we had variable rate debt of $10.9 million outstanding. All of the debt outstanding under our revolving credit facility (none was outstanding at September 30, 2012) and our loan relating to the tax-exempt waste disposal revenue bonds are at variable rates. We do not currently hedge our variable interest rate debt, but we may do so in the future. The average variable interest rate for our variable rate debt of $10.9 million as of September 30, 2012 was 0.34%. A hypothetical 100 basis point increase in the average interest rate on our variable rate debt would increase our annual interest expense by approximately $0.1 million. Also, at September 30, 2012, we had $754.0 million aggregate principal amount of fixed rate debt. We are subject to the risk of higher interest cost if and when this debt is refinanced. If interest rates are 1% higher at the time of refinancing, our annual interest expense would increase by approximately $7.5 million.

Item 4. Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer, of the effectiveness of our disclosure controls and procedures pursuant to Rules 13a-15 or 15d-15 under the Securities Exchange Act of 1934 as of the end of the period covered by this report. Based upon that evaluation, our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer concluded that our disclosure controls and procedures are effective with respect to (i) the accumulation and communication to our management, including our Chief Executive Officer and our Chief Financial Officer, of information required to be disclosed by us in the reports that we submit under the Exchange Act, and

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(ii) the recording, processing, summarizing and reporting of such information within the time periods specified in the SEC’s rules and forms.

There were no changes in our internal control over financial reporting that occurred during the three months ended September 30, 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The 2011 Form 10-K, filed on February 23, 2012, contained a description of various legal proceedings in which we are involved, including environmental proceedings at our facilities in Calvert City. See Note 13 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q for a description of certain of those proceedings, which information is incorporated by reference herein.

Item 1A. Risk Factors

For a discussion of risk factors, please read Item 1A, “Risk Factors” in the 2011 Form 10-K. There have been no material changes from those risk factors.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information on our purchase of equity securities during the quarter ended September 30, 2012:

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under  the Plans or  Programs (1)
July 2012	—	$	—	—	$	86,698,000
August 2012	—	$	—	—	$	86,698,000
September 2012	—	$	—	—	$	86,698,000
	—	$	—	—

_____________

(1) On August 22, 2011, we announced the authorization by our Board of Directors of a $100.0 million stock repurchase program. As of September 30, 2012, 284,493 shares of common stock had been acquired at an aggregate purchase price of $13.3 million. Decisions regarding the amount and the timing of purchases under the program will be influenced by our cash on hand, our cash flow from operations, general market conditions and other factors. The program may be discontinued by our Board of Directors at any time.

34

Item 6. Exhibits

Exhibit No.
4.1	Sixth Supplemental Indenture, dated as of July 17, 2012, among the Company, the Subsidiary Guarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, filed with the Securities and Exchange Commission on July 16, 2012, File No. 1-32260)
4.2	Form of the Company's 3.60% Senior Notes due 2022 (included in Exhibit 4.1)
31.1	Rule 13a – 14(a) / 15d – 14(a) Certification (Principal Executive Officer)
31.2	Rule 13a – 14(a) / 15d – 14(a) Certification (Principal Financial Officer)
32.1	Section 1350 Certification (Principal Executive Officer and Principal Financial Officer)
101.INS	XBRL Instance Document (1)
101.SCH	XBRL Taxonomy Extension Schema Document (1)
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document (1)
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document (1)
101.LAB	XBRL Taxonomy Extension Label Linkbase Document (1)
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document (1)

_____________

(1) Pursuant to Rule 406T of Regulation S-T, this interactive data file is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

35

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		WESTLAKE CHEMICAL CORPORATION
Date:	November 8, 2012	By:	/S/    ALBERT CHAO
			Albert Chao
			President and Chief Executive Officer (Principal Executive Officer)
Date:	November 8, 2012	By:	/S/    M. STEVEN BENDER
			M. Steven Bender
			Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

36

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Albert Chao, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 8, 2012	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, M. Steven Bender, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 8, 2012	/S/ M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Westlake Chemical Corporation (the “Company”) on Form 10-Q for the fiscal quarter ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Albert Chao, President and Chief Executive Officer of the Company, and I, M. Steven Bender, Senior Vice President, Chief Financial Officer and Treasurer of the Company, certify, to the best of our knowledge, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material aspects, the financial condition and results of operations of the Company.

Date:	November 8, 2012	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)
Date:	November 8, 2012	/S/    M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

XML

Other Assets (Available-for-sale Investments, Realized Gain) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Assets [Abstract]
Proceeds from sale of available-for-sale equity securities	$ 1,628	$ 0	$ 47,655	$ 0
Gross realized gains	$ 477	$ 0	$ 16,429	$ 0

XML

Earnings per Share (Reconciliation of Denominator for Basic and Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Basic	66,311,958	66,012,102	66,240,225	65,919,892
Plus incremental shares from: Assumed exercise of options	344,802	369,830	381,295	387,712
Weighted average common shares-diluted	66,656,760	66,381,932	66,621,520	66,307,604
Earnings per share: Basic	$ 1.30	$ 1.02	$ 4.36	$ 3.50
Earnings per share: Diluted	$ 1.30	$ 1.01	$ 4.33	$ 3.48

XML

Derivative Instruments (Impact of Derivative Instruments Not Designated as Fair Value Hedges) (Details) (Derivatives Not Designated As Hedging Instruments, Commodity Forward Contracts, Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives Not Designated As Hedging Instruments | Commodity Forward Contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 249	$ 371	$ (783)	$ 838

XML

Pension and Post-Retirement Benefit Costs (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 250	$ 224	$ 754	$ 705
Interest cost	645	681	1,936	2,042
Expected return on plan assets	(623)	(570)	(1,867)	(1,709)
Amortization of prior service cost	74	74	223	223
Amortization of net loss	445	322	1,329	948
Net periodic benefit cost	791	731	2,375	2,209
Post-Retirement Healthcare
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	4	7	12
Interest cost	185	209	555	628
Amortization of transition obligation	0	28	0	85
Amortization of prior service cost	21	47	63	140
Amortization of net loss	44	28	132	84
Net periodic benefit cost	$ 252	$ 316	$ 757	$ 949

XML

Derivative Instruments (Impact of Derivative Instruments Designated as Fair Value Hedges and Related Hedges Item) (Details) (Designated As Fair Value Hedges, Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Firm Commitment Derivative Items Designated As Hedged Item
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 515	$ 1,780	$ (13,546)	$ 1,780
Commodity Forward Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ (515)	$ (1,780)	$ 12,345	$ (1,780)

XML

Guarantor Disclosures (Tables)

9 Months Ended

Sep. 30, 2012

Guarantees [Abstract]

Condensed Consolidating Financial Information Balance Sheet

Condensed Consolidating Financial Information as of September 30, 2012

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	1,168,124	$	5,693	$	24,651	$	—		$	1,198,468
Accounts receivable, net	19,803		1,685,259		5,480		(1,316,950		)	393,592
Inventories	—		357,780		13,757		—			371,537
Prepaid expenses and other    current assets	292		11,253		2,927		—			14,472
Deferred income taxes	430		19,085		221		—			19,736
Total current assets	1,188,649		2,079,070		47,036		(1,316,950		)	1,997,805
Property, plant and equipment, net	—		1,386,453		7,745		—			1,394,198
Equity investments	2,910,021		53,908		33,244		(2,952,999		)	44,174
Other assets, net	17,622		106,350		1,714		(17,689		)	107,997
Total assets	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174
Current liabilities
Accounts payable	$	1,314,329	$	179,772	$	11,073	$	(1,305,736	)	$	199,438
Accrued liabilities	15,640		157,906		1,037		(11,214		)	163,369
Total current liabilities	1,329,969		337,678		12,110		(1,316,950		)	362,807
Long-term debt	752,842		10,889		11,500		(11,500		)	763,731
Deferred income taxes	—		340,197		1,386		(6,189		)	335,394
Other liabilities	53		48,704		57		—			48,814
Stockholders’ equity	2,033,428		2,888,313		64,686		(2,952,999		)	2,033,428
Total liabilities and    stockholders’ equity	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174

Condensed Consolidating Financial Information as of December 31, 2011

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	803,320	$	2,517	$	20,064	$	—		$	825,901
Accounts receivable, net	—		1,384,705		949		(978,282		)	407,372
Inventories	—		478,229		12,548		—			490,777
Prepaid expenses and other    current assets	363		10,332		1,800		—			12,495
Deferred income taxes	430		19,049		132		—			19,611
Total current assets	804,113		1,894,832		35,493		(978,282		)	1,756,156
Property, plant and equipment, net	—		1,223,073		8,993		—			1,232,066
Equity investments	2,597,598		53,912		35,650		(2,640,419		)	46,741
Restricted cash	96,283		—		—		—			96,283
Other assets, net	17,650		132,968		2,467		(17,510		)	135,575
Total assets	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821
Current liabilities
Accounts payable	$	1,005,529	$	210,476	$	3,748	$	(992,719	)	$	227,034
Accrued liabilities	76		120,656		2,392		14,437			137,561
Total current liabilities	1,005,605		331,132		6,140		(978,282		)	364,595
Long-term debt	753,674		10,889		11,500		(11,500		)	764,563
Deferred income taxes	—		336,165		636		(6,010		)	330,791
Other liabilities	53		50,458		49		—			50,560
Stockholders’ equity	1,756,312		2,576,141		64,278		(2,640,419		)	1,756,312
Total liabilities and    stockholders’ equity	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821

Condensed Consolidating Financial Information Statement Of Operations

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	809,164		$	13,876		$	(1,865	)	$	821,175
Cost of sales	—			638,892			11,969			(1,865		)	648,996
Gross profit	—			170,272			1,907			—			172,179
Selling, general and administrative    expenses	498			27,601			1,563			—			29,662
(Loss) income from operations	(498		)	142,671			344			—			142,517
Interest expense	(11,919		)	(15		)	—			—			(11,934		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	—			477			—			—			477
Other income (expense), net	4,556			(2,744		)	(590		)	—			1,222
(Loss) income before income taxes	(14,943		)	140,389			(246		)	—			125,200
(Benefit from) provision for income taxes	(4,498		)	42,596			138			—			38,236
Equity in net income of subsidiaries	97,409			—			—			(97,409		)	—
Net income (loss)	$	86,964		$	97,793		$	(384	)	$	(97,409	)	$	86,964
Comprehensive income	$	88,666		$	98,109		$	481		$	(98,590	)	$	88,666

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	956,390	$	12,708		$	(726	)	$	968,372
Cost of sales	—			810,516		11,515			(726		)	821,305
Gross profit	—			145,874		1,193			—			147,067
Selling, general and administrative    expenses	1,125			27,242		1,369			—			29,736
(Loss) income from operations	(1,125		)	118,632		(176		)	—			117,331
Interest expense	(12,727		)	—		—			—			(12,727		)
Other income (expense), net	1,396			950		(889		)	—			1,457
(Loss) income before income taxes	(12,456		)	119,582		(1,065		)	—			106,061
(Benefit from) provision for income taxes	(4,510		)	43,190		(549		)	—			38,131
Equity in net income of subsidiaries	75,876			—		—			(75,876		)	—
Net income (loss)	$	67,930		$	76,392	$	(516	)	$	(75,876	)	$	67,930
Comprehensive income (loss)	$	60,503		$	70,019	$	(1,570	)	$	(68,449	)	$	60,503

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,738,180		$	37,154		$	(5,334	)	$	2,770,000
Cost of sales	—			2,197,300			31,322			(5,334		)	2,223,288
Gross profit	—			540,880			5,832			—			546,712
Selling, general and administrative    expenses	1,500			81,288			4,804			—			87,592
(Loss) income from operations	(1,500		)	459,592			1,028			—			459,120
Interest expense	(35,652		)	(30		)	—			—			(35,682		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	1			16,428			—			—			16,429
Other income (expense), net	12,044			(5,724		)	(2,644		)	—			3,676
(Loss) income before income taxes	(32,189		)	470,266			(1,616		)	—			436,461
(Benefit from) provision for income taxes	(11,105		)	158,228			(940		)	—			146,183
Equity in net income of subsidiaries	311,362			—			—			(311,362		)	—
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Comprehensive income	$	291,185		$	312,017		$	252		$	(312,269	)	$	291,185

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,731,248		$	32,331		$	(2,906	)	$	2,760,673
Cost of sales	—			2,251,296			30,537			(2,906		)	2,278,927
Gross profit	—			479,952			1,794			—			481,746
Selling, general and administrative    expenses	3,149			78,283			3,977			—			85,409
(Loss) income from operations	(3,149		)	401,669			(2,183		)	—			396,337
Interest expense	(38,403		)	(46		)	—			—			(38,449		)
Other income (expense), net	6,410			(2,090		)	(24		)	—			4,296
(Loss) income before income taxes	(35,142		)	399,533			(2,207		)	—			362,184
(Benefit from) provision for income taxes	(11,858		)	142,247			(728		)	—			129,661
Equity in net income of subsidiaries	255,807			—			—			(255,807		)	—
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Comprehensive income (loss)	$	225,981		$	251,474		$	(2,209	)	$	(249,265	)	$	225,981

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,149			107,191			2,410			—			110,750
Deferred income taxes	(176		)	3,932			629			—			4,385
Net changes in working capital    and other	(310,163		)	95,909			(1,898		)	311,362			95,210
Net cash (used for) provided by    operating activities	(18,912		)	519,070			465			—			500,623
Cash flows from investing activities
Additions to property, plant and    equipment	—			(234,713		)	(750		)	—			(235,463		)
Construction of assets pending    sale-leaseback	—			(5,484		)	—			—			(5,484		)
Proceeds from disposition of assets	—			414			21			—			435
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Proceeds from sales of equity securities	3			47,652			—			—			47,655
Purchase of investments	—			(2,961		)	—			—			(2,961		)
Settlements of derivative instruments	—			471			—			—			471
Net cash provided by (used for)    investing activities	3			(194,621		)	34			—			(194,584		)
Cash flows from financing activities
Intercompany financing	317,185			(321,273		)	4,088			—			—
Capitalized debt issuance costs	(2,221		)	—			—			—			(2,221		)
Dividends paid	(22,345		)	—			—			—			(22,345		)
Proceeds from borrowings	248,818			—			—			—			248,818
Proceeds from exercise of stock options	6,627			—			—			—			6,627
Repayment of borrowings	(250,000		)	—			—			—			(250,000		)
Repurchase of common stock for treasury	(10,784		)	—			—			—			(10,784		)
Utilization of restricted cash	96,433			—			—			—			96,433
Net cash provided by (used for)    financing activities	383,713			(321,273		)	4,088			—			66,528
Net increase in cash and cash equivalents	364,804			3,176			4,587			—			372,567
Cash and cash equivalents at beginning    of period	803,320			2,517			20,064			—			825,901
Cash and cash equivalents at end of period	$	1,168,124		$	5,693		$	24,651		$	—		$	1,198,468

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,290			95,486			2,757			—			99,533
Deferred income taxes	(1,430		)	21,010			(145		)	—			19,435
Net changes in working capital    and other	(255,859		)	(104,494		)	(2,592		)	255,807			(107,138		)
Net cash (used for) provided by    operating activities	(23,476		)	269,288			(1,459		)	—			244,353
Cash flows from investing activities
Additions to property, plant and equipment	—			(110,887		)	(936		)	—			(111,823		)
Proceeds from disposition of assets	—			2,453			3			—			2,456
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Purchase of investments	—			(29,877		)	—			—			(29,877		)
Settlements of derivative instruments	—			(331		)	—			—			(331		)
Net cash used for investing    activities	—			(138,642		)	(170		)	—			(138,812		)
Cash flows from financing activities
Intercompany financing	129,251			(129,158		)	(93		)	—			—
Capitalized debt issuance costs	(2,540		)	—			—			—			(2,540		)
Dividends paid	(13,359		)	—			—			—			(13,359		)
Proceeds from exercise of stock options	5,323			—			—			—			5,323
Repurchase of common stock for treasury	(19		)	—			—			—			(19		)
Utilization of restricted cash	33,694			—			—			—			33,694
Net cash provided by (used for)    financing activities	152,350			(129,158		)	(93		)	—			23,099
Net increase (decrease) in cash and    cash equivalents	128,874			1,488			(1,722		)	—			128,640
Cash and cash equivalents at beginning    of period	611,158			53			19,088			—			630,299
Cash and cash equivalents at end of period	$	740,032		$	1,541		$	17,366		$	—		$	758,939

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Commitments and Contingencies (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended		1 Months Ended	12 Months Ended
	Mar. 17, 2010	Dec. 31, 2007	Sep. 30, 2012	Dec. 31, 2007 Polyone	Dec. 31, 2011 Polyone
Commitments and Contingencies Disclosure [Line Items]
Minimum number of years between arbitrations		5 years
Reimbursement of remediation costs sought by PolyOne	$ 1,400
Percentage of costs related to environmental issues to be paid by PolyOne				100.00%
Costs incurred environmental remediation services					3,287
Agreed cash penalty payment to settle allegations resulting from audit			$ 500

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Inventories (Tables)

9 Months Ended

Sep. 30, 2012

Inventory Disclosure [Abstract]

Schedule Of Inventory

Inventories consist of the following:

	September 30, 2012		December 31, 2011
Finished products	$	174,724	$	234,830
Feedstock, additives and chemicals	144,140		207,899
Materials and supplies	52,673		48,048
Inventories	$	371,537	$	490,777

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Fair Value Measurements (Summary of Carrying and Fair Values of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	9 Months Ended					0 Months Ended	9 Months Ended					9 Months Ended					9 Months Ended					9 Months Ended					9 Months Ended					9 Months Ended
	Jul. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 31, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016 Carrying Value	Dec. 31, 2011 6 5/8% Senior Notes Due 2016 Carrying Value	Sep. 30, 2012 6 5/8% Senior Notes Due 2016 Fair Value	Dec. 31, 2011 6 5/8% Senior Notes Due 2016 Fair Value	Jul. 17, 2012 3.60% Senior Notes Due 2022	Sep. 30, 2012 3.60% Senior Notes Due 2022	Sep. 30, 2012 3.60% Senior Notes Due 2022 Carrying Value	Dec. 31, 2011 3.60% Senior Notes Due 2022 Carrying Value	Sep. 30, 2012 3.60% Senior Notes Due 2022 Fair Value	Dec. 31, 2011 3.60% Senior Notes Due 2022 Fair Value	Sep. 30, 2012 6 1/2% Senior Notes Due 2029	Sep. 30, 2012 6 1/2% Senior Notes Due 2029 Carrying Value	Dec. 31, 2011 6 1/2% Senior Notes Due 2029 Carrying Value	Sep. 30, 2012 6 1/2% Senior Notes Due 2029 Fair Value	Dec. 31, 2011 6 1/2% Senior Notes Due 2029 Fair Value	Sep. 30, 2012 6 3/4% Senior Notes Due 2032	Sep. 30, 2012 6 3/4% Senior Notes Due 2032 Carrying Value	Dec. 31, 2011 6 3/4% Senior Notes Due 2032 Carrying Value	Sep. 30, 2012 6 3/4% Senior Notes Due 2032 Fair Value	Dec. 31, 2011 6 3/4% Senior Notes Due 2032 Fair Value	Sep. 30, 2012 2035 GO Zone 6 1/2% Notes	Sep. 30, 2012 2035 GO Zone 6 1/2% Notes Carrying Value	Dec. 31, 2011 2035 GO Zone 6 1/2% Notes Carrying Value	Sep. 30, 2012 2035 GO Zone 6 1/2% Notes Fair Value	Dec. 31, 2011 2035 GO Zone 6 1/2% Notes Fair Value	Sep. 30, 2012 2035 IKE Zone 6 1/2% Notes	Sep. 30, 2012 2035 IKE Zone 6 1/2% Notes Carrying Value	Dec. 31, 2011 2035 IKE Zone 6 1/2% Notes Carrying Value	Sep. 30, 2012 2035 IKE Zone 6 1/2% Notes Fair Value	Dec. 31, 2011 2035 IKE Zone 6 1/2% Notes Fair Value	Sep. 30, 2012 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027	Sep. 30, 2012 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value	Dec. 31, 2011 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value	Sep. 30, 2012 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value	Dec. 31, 2011 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity	2016	2016	2016					2022	2022					2029					2032					2035					2035					2027
Stated interest rate	6.625%		6.625%					3.60%	3.60%					6.50%					6.75%					6.50%					6.50%
Senior notes				$ 0	$ 249,674	$ 0	$ 254,890			$ 248,842	$ 0	$ 253,738	$ 0		$ 100,000	$ 100,000	$ 115,619	$ 108,834		$ 250,000	$ 250,000	$ 288,515	$ 263,988		$ 89,000	$ 89,000	$ 103,031	$ 93,090		$ 65,000	$ 65,000	$ 75,247	$ 67,987
Loans																																			$ 10,889	$ 10,889	$ 10,889	$ 10,889

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Long-Term Debt (Revolving Credit Facility) (Details) (Line of Credit [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400,000
Percentage of commitment on borrowing availability	0.375%
Letters of credit outstanding	16,214
Remaining borrowing capacity	$ 365,865
Plus Libor [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	1.75%
Plus Libor [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	2.25%
Plus Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.25%
Plus Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.75%

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Other Assets (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Other Assets [Abstract]
Investments in other assets					$ 30,113
Unrealized gain on available for sale securities					1,185
Unrealized gain on available for sale securities, tax expense					663
Amortization expense on intangible assets, included in other assets	$ 8,717	$ 5,664	$ 20,135	$ 17,110

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Earnings per Share (Additional Information) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Options excluded from computation of earnings per share, shares	168,362	99,592	293,062	151,923

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Segment Information (Total Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,544,174	$ 3,266,821
Olefins
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,355,157	1,441,752
Vinyls
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	956,665	824,825
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,232,352	$ 1,000,244

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Derivative Instruments (Impact of Derivative Instruments Designated as Cash Flow Hedges) (Details) (Cash Flow Hedging, Treasury Lock, Interest Expense, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cash Flow Hedging | Treasury Lock | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ (813)	$ 0	$ (813)	$ 0

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Inventories

9 Months Ended

Sep. 30, 2012

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consist of the following:

	September 30, 2012		December 31, 2011
Finished products	$	174,724	$	234,830
Feedstock, additives and chemicals	144,140		207,899
Materials and supplies	52,673		48,048
Inventories	$	371,537	$	490,777

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Guarantor Disclosures (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Ownership interest in guarantor subsidiaries	100.00%
3.60% Senior Notes Due 2022
Condensed Financial Statements, Captions [Line Items]
Minimum debt amount guaranteed by subsidiaries	5,000

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Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 1,515	$ 1,636	$ 4,640	$ 4,762

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Summary Of Assets And Liabilities Accounted At Fair Value On A Recurring Basis

The following tables summarize, by level within the fair value hierarchy, the Company’s assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2012
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,213	$	8,630		$	9,843
Risk management liabilities - Commodity forward contracts	—		(2,892		)	(2,892		)
Firm commitments
Hedged portion of firm commitment	—		1,019			1,019
Hedged portion of firm commitment	—		(8,630		)	(8,630		)
	December 31, 2011
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,090	$	1,347		$	2,437
Risk management liabilities - Commodity forward contracts	—		(4,235		)	(4,235		)
Firm commitments
Hedged portion of firm commitment	—		3,262			3,262
Marketable securities
Available-for-sale equity securities	30,113		—			30,113

Summary Of Carrying And Fair Values Of Long-Term Debt

The carrying and fair values of the Company’s long-term debt are summarized in the table below. The Company’s long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company’s long-term debt. Because the Company’s long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company’s long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	September 30, 2012				December 31, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
6 5/8% senior notes due 2016	$	—	$	—	$	249,674	$	254,890
3.60% senior notes due 2022	248,842		253,738		—		—
6 1/2% senior notes due 2029	100,000		115,619		100,000		108,834
6 3/4% senior notes due 2032	250,000		288,515		250,000		263,988
6 1/2% GO Zone Senior Notes Due 2035	89,000		103,031		89,000		93,090
6 1/2% IKE Zone Senior Notes Due 2035	65,000		75,247		65,000		67,987
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Values of Derivatives Instruments in Consolidated Balance Sheets

The fair values of derivative instruments in the Company’s consolidated balance sheets were as follows:

	Asset Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	8,630	$	—
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	1,213		2,437
Total asset derivatives		$	9,843	$	2,437

	Liability Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	1,019	$	3,262
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	1,873		973
Total liability derivatives		$	2,892	$	4,235

Impact of Derivatives Instruments Designated as Fair Value Hedges

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company’s consolidated statements of operations. For the three and nine months ended September 30, 2012, there was no material ineffectiveness with regard to the Company’s qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Commodity forward contracts	Cost of sales	$	(515	)	$	(1,780	)	$	12,345		$	(1,780	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Firm commitment designated as the    hedged item	Cost of sales	$	515		$	1,780		$	(13,546	)	$	1,780

Impact of Derivative Instruments Designated as Cash Flow Hedges

The following table reflects the impact of derivative instruments designated as cash flow hedges on the Company’s consolidated statements of operations for the three and nine months ended September 30, 2012.

Derivatives in Cash Flow    Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Three Months Ended September 30,					Nine Months Ended September 30,
		2012			2011		2012			2011
Treasury lock agreements	Interest expense	$	(813	)	$	—	$	(813	)	$	—

Impact of Derivative Instruments Not Designated as Fair Value Hedges

The impact of derivative instruments that have not been designated as hedges on the Company’s consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012			2011
Commodity forward contracts	Cost of sales	$	249	$	371	$	(783	)	$	838

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Pension and Post-Retirement Benefit Costs (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Salaried Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 2,283	$ 1,692
Expected additional contributions	579
Wage Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	1,542	1,362
Expected additional contributions	$ 381

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Derivative Instruments (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	1 Months Ended		1 Months Ended
	Jul. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 31, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 17, 2012 3.60% Senior Notes Due 2022	Sep. 30, 2012 3.60% Senior Notes Due 2022	Jul. 31, 2012 Refinancing of Debt 3.60% Senior Notes Due 2022	Jul. 17, 2012 Refinancing of Debt 3.60% Senior Notes Due 2022	Jul. 31, 2012 Treasury Lock	Sep. 30, 2012 Commodity Forward Contracts Designated As Fair Value Hedges gal
Derivative [Line Items]
Feedstock forward contracts, in gallons									53,550,000
Senior notes, principal amount refinanced		$ 250,000
Maturity	2016	2016	2016	2022	2022	2022
Senior notes, principal amount issued				250,000			250,000
Payments to the counterparties								$ 1,940

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Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Less:
Net income attributable to participating securities	(452		)	(598		)	(1,682		)	(2,087		)
Net income attributable to common shareholders	$	86,512		$	67,332		$	288,596		$	230,436

Reconciliation Of Denominator For Basic And Diluted Earnings Per Share

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Weighted average common shares—basic	66,311,958		66,012,102		66,240,225		65,919,892
Plus incremental shares from:
Assumed exercise of options	344,802		369,830		381,295		387,712
Weighted average common shares—diluted	66,656,760		66,381,932		66,621,520		66,307,604
Earnings per share:
Basic	$	1.30	$	1.02	$	4.36	$	3.50
Diluted	$	1.30	$	1.01	$	4.33	$	3.48

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Pension and Post-Retirement Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost are as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	Pension						Post-retirement Healthcare				Pension						Post-retirement Healthcare
	2012			2011			2012		2011		2012			2011			2012		2011
Service cost	$	250		$	224		$	2	$	4	$	754		$	705		$	7	$	12
Interest cost	645			681			185		209		1,936			2,042			555		628
Expected return on plan assets	(623		)	(570		)	—		—		(1,867		)	(1,709		)	—		—
Amortization of transition    obligation	—			—			—		28		—			—			—		85
Amortization of prior service    cost	74			74			21		47		223			223			63		140
Amortization of net loss	445			322			44		28		1,329			948			132		84
Net periodic benefit cost	$	791		$	731		$	252	$	316	$	2,375		$	2,209		$	757	$	949

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Accounts Receivable

9 Months Ended

Sep. 30, 2012

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2012			December 31, 2011
Trade customers	$	375,389		$	391,401
Affiliates	226			122
Allowance for doubtful accounts	(10,487		)	(10,969		)
	365,128			380,554
Federal and state taxes	13,151			16,113
Other	15,313			10,705
Accounts receivable, net	$	393,592		$	407,372

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Segment Reporting Information

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net external sales
Olefins
Polyethylene	$	431,614		$	444,077		$	1,275,057		$	1,358,631
Ethylene, styrene and other	108,171			251,597			669,718			587,438
Total Olefins	539,785			695,674			1,944,775			1,946,069
Vinyls
PVC, caustic soda and other	191,310			198,046			569,316			583,214
Building products	90,080			74,652			255,909			231,390
Total Vinyls	281,390			272,698			825,225			814,604
	$	821,175		$	968,372		$	2,770,000		$	2,760,673
Intersegment sales
Olefins	$	76,771		$	109,140		$	247,671		$	327,584
Vinyls	391			376			1,167			1,100
	$	77,162		$	109,516		$	248,838		$	328,684
Income (loss) from operations
Olefins	$	124,452		$	105,353		$	409,550		$	383,376
Vinyls	24,059			16,123			67,724			23,565
Corporate and other	(5,994		)	(4,145		)	(18,154		)	(10,604		)
	$	142,517		$	117,331		$	459,120		$	396,337
Depreciation and amortization
Olefins	$	27,070		$	21,746		$	74,903		$	64,998
Vinyls	11,232			10,967			34,330			32,782
Corporate and other	122			148			368			464
	$	38,424		$	32,861		$	109,601		$	98,244

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Other income (expense), net
Olefins	$	806		$	949		$	2,764		$	2,033
Vinyls	146			(303		)	115			179
Corporate and other	270			811			797			2,084
	$	1,222		$	1,457		$	3,676		$	4,296
Provision for (benefit from) income taxes
Olefins	$	36,092		$	34,867		$	130,612		$	128,405
Vinyls	6,556			5,277			18,989			5,847
Corporate and other	(4,412		)	(2,013		)	(3,418		)	(4,591		)
	$	38,236		$	38,131		$	146,183		$	129,661
Capital expenditures
Olefins	$	46,867		$	26,570		$	92,168		$	59,969
Vinyls	47,001			15,447			139,836			50,454
Corporate and other	1,027			628			3,459			1,400
	$	94,895		$	42,645		$	235,463		$	111,823

Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Income from operations	$	142,517		$	117,331		$	459,120		$	396,337
Interest expense	(11,934		)	(12,727		)	(35,682		)	(38,449		)
Debt retirement costs	(7,082		)	—			(7,082		)	—
Gain from sales of equity securities	477			—			16,429			—
Other income, net	1,222			1,457			3,676			4,296
Income before income taxes	$	125,200		$	106,061		$	436,461		$	362,184

Total Assets

	September 30, 2012		December 31, 2011
Total assets
Olefins	$	1,355,157	$	1,441,752
Vinyls	956,665		824,825
Corporate and other	1,232,352		1,000,244
	$	3,544,174	$	3,266,821

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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended	1 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Jul. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 31, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016	Dec. 31, 2011 6 5/8% Senior Notes Due 2016	Jul. 17, 2012 3.60% Senior Notes Due 2022	Sep. 30, 2012 3.60% Senior Notes Due 2022	Dec. 31, 2011 3.60% Senior Notes Due 2022	Sep. 30, 2012 6 1/2% Senior Notes Due 2029	Dec. 31, 2011 6 1/2% Senior Notes Due 2029	Sep. 30, 2012 6 3/4% Senior Notes Due 2032	Dec. 31, 2011 6 3/4% Senior Notes Due 2032	Sep. 30, 2012 2035 GO Zone 6 1/2% Notes	Dec. 31, 2011 2035 GO Zone 6 1/2% Notes	Sep. 30, 2012 2035 IKE Zone 6 1/2% Notes	Dec. 31, 2011 2035 IKE Zone 6 1/2% Notes	Sep. 30, 2012 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027	Dec. 31, 2011 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027
Debt Instrument [Line Items]
Maturity			2016	2016	2016		2022	2022		2029		2032		2035		2035		2027
Stated interest rate			6.625%		6.625%		3.60%	3.60%		6.50%		6.75%		6.50%		6.50%
Senior notes					$ 0	$ 249,674		$ 248,842	$ 0	$ 100,000	$ 100,000	$ 250,000	$ 250,000	$ 89,000	$ 89,000	$ 65,000	$ 65,000
Non-current loan payable																		10,889	10,889
Long-term debt	$ 763,731	$ 764,563

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Earnings per Share (Schedule of Net Income Attributable to Common Stockholders) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Net income	$ 86,964	$ 67,930	$ 290,278	$ 232,523
Less: Net income attributable to participating securities	(452)	(598)	(1,682)	(2,087)
Net income attributable to common shareholders	$ 86,512	$ 67,332	$ 288,596	$ 230,436

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 1,198,468	$ 825,901
Accounts receivable, net	393,592	407,372
Inventories	371,537	490,777
Prepaid expenses and other current assets	14,472	12,495
Deferred income taxes	19,736	19,611
Total current assets	1,997,805	1,756,156
Property, plant and equipment, net	1,394,198	1,232,066
Equity investments	44,174	46,741
Restricted cash		96,283
Other assets, net	107,997	135,575
Total assets	3,544,174	3,266,821
Current liabilities
Accounts payable	199,438	227,034
Accrued liabilities	163,369	137,561
Total current liabilities	362,807	364,595
Long-term debt	763,731	764,563
Deferred income taxes	335,394	330,791
Other liabilities	48,814	50,560
Total liabilities	1,510,746	1,510,509
Commitments and contingencies (Notes 6 and 13)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 150,000,000 shares authorized; 66,981,077 and 66,601,909 shares issued at September 30, 2012 and December 31, 2011, respectively	670	666
Common stock, held in treasury, at cost; 284,493 and 69,816 shares at September 30, 2012 and December 31, 2011, respectively	(13,302)	(2,518)
Additional paid-in capital	486,852	467,796
Retained earnings	1,567,371	1,299,438
Accumulated other comprehensive loss	(8,163)	(9,070)
Total stockholders' equity	2,033,428	1,756,312
Total liabilities and stockholders' equity	$ 3,544,174	$ 3,266,821

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Derivative Instruments (Fair Values of Derivative Instruments in Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Liabilities
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 2,892	$ 4,235
Accounts Receivable
Derivatives, Fair Value [Line Items]
Total asset derivatives	9,843	2,437
Commodity Forward Contracts | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives designated as hedging instruments, Liability Derivatives	1,019	3,262
Derivatives not designated as hedging instruments, Liability Derivatives	1,873	973
Commodity Forward Contracts | Accounts Receivable
Derivatives, Fair Value [Line Items]
Derivatives designated as hedging instruments, Asset Derivatives	8,630	0
Derivatives not designated as hedging instruments, Asset Derivatives	$ 1,213	$ 2,437

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income	$ 290,278	$ 232,523
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	109,601	98,244
(Recovery of) provision for doubtful accounts	(536)	917
Amortization of debt issuance costs	1,149	1,289
Stock-based compensation expense	4,640	4,762
Loss from disposition of fixed assets	1,945	1,022
Gain from sales of equity securities	(16,429)	0
Impairment of long-lived assets	0	1,975
Write-off of debt issuance costs	1,277	0
Deferred income taxes	4,385	19,435
Equity in loss (income) of joint ventures	2,567	(2,443)
Changes in operating assets and liabilities
Accounts receivable	13,732	(100,524)
Inventories	119,240	(16,220)
Prepaid expenses and other current assets	(1,977)	4,039
Accounts payable	(35,651)	(9,558)
Accrued liabilities	20,077	14,330
Other, net	(13,675)	(5,438)
Net cash (used for) provided by operating activities	500,623	244,353
Cash flows from investing activities
Additions to property, plant and equipment	(235,463)	(111,823)
Construction of assets pending sale-leaseback	(5,484)	0
Proceeds from disposition of assets	435	2,456
Proceeds from repayment of loan to affiliate	763	763
Proceeds from sales of equity securities	47,655	0
Purchase of investments	(2,961)	(29,877)
Settlements of derivative instruments	471	(331)
Net cash provided by (used for) investing activities	(194,584)	(138,812)
Cash flows from financing activities
Capitalized debt issuance costs	(2,221)	(2,540)
Dividends paid	(22,345)	(13,359)
Proceeds from borrowings	248,818	0
Proceeds from exercise of stock options	6,627	5,323
Repayment of borrowings	(250,000)	0
Repurchase of common stock for treasury	(10,784)	(19)
Utilization of restricted cash	96,433	33,694
Net cash provided by (used for) financing activities	66,528	23,099
Net increase (decrease) in cash and cash equivalents	372,567	128,640
Cash and cash equivalents at beginning of period	825,901	630,299
Cash and cash equivalents at end of period	$ 1,198,468	$ 758,939

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net external sales	$ 821,175	$ 968,372	$ 2,770,000	$ 2,760,673
Intersegment sales	77,162	109,516	248,838	328,684
Income (loss) from operations	142,517	117,331	459,120	396,337
Depreciation and amortization	38,424	32,861	109,601	98,244
Other income, net	1,222	1,457	3,676	4,296
Provision for (benefit from) income taxes	38,236	38,131	146,183	129,661
Capital expenditures	94,895	42,645	235,463	111,823
Olefins
Segment Reporting Information [Line Items]
Net external sales	539,785	695,674	1,944,775	1,946,069
Intersegment sales	76,771	109,140	247,671	327,584
Income (loss) from operations	124,452	105,353	409,550	383,376
Depreciation and amortization	27,070	21,746	74,903	64,998
Other income, net	806	949	2,764	2,033
Provision for (benefit from) income taxes	36,092	34,867	130,612	128,405
Capital expenditures	46,867	26,570	92,168	59,969
Vinyls
Segment Reporting Information [Line Items]
Net external sales	281,390	272,698	825,225	814,604
Intersegment sales	391	376	1,167	1,100
Income (loss) from operations	24,059	16,123	67,724	23,565
Depreciation and amortization	11,232	10,967	34,330	32,782
Other income, net	146	(303)	115	179
Provision for (benefit from) income taxes	6,556	5,277	18,989	5,847
Capital expenditures	47,001	15,447	139,836	50,454
Corporate and Other
Segment Reporting Information [Line Items]
Income (loss) from operations	(5,994)	(4,145)	(18,154)	(10,604)
Depreciation and amortization	122	148	368	464
Other income, net	270	811	797	2,084
Provision for (benefit from) income taxes	(4,412)	(2,013)	(3,418)	(4,591)
Capital expenditures	1,027	628	3,459	1,400
Polyethylene | Olefins
Segment Reporting Information [Line Items]
Net external sales	431,614	444,077	1,275,057	1,358,631
Ethylene, Styrene And Other | Olefins
Segment Reporting Information [Line Items]
Net external sales	108,171	251,597	669,718	587,438
PVC, Caustic Soda And Other | Vinyls
Segment Reporting Information [Line Items]
Net external sales	191,310	198,046	569,316	583,214
Building Products | Vinyls
Segment Reporting Information [Line Items]
Net external sales	$ 90,080	$ 74,652	$ 255,909	$ 231,390

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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Finished products	$ 174,724	$ 234,830
Feedstock, additives and chemicals	144,140	207,899
Materials and supplies	52,673	48,048
Inventories	$ 371,537	$ 490,777

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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 290,278	$ 232,523
Depreciation and amortization	110,750	99,533
Deferred income taxes	4,385	19,435
Net changes in working capital and other	95,210	(107,138)
Net cash (used for) provided by operating activities	500,623	244,353
Additions to property, plant and equipment	(235,463)	(111,823)
Construction of assets pending sale-leaseback	(5,484)	0
Proceeds from disposition of assets	435	2,456
Proceeds from repayment of loan to affiliate	763	763
Proceeds from sales of equity securities	47,655	0
Purchase of investments	(2,961)	(29,877)
Settlements of derivative instruments	471	(331)
Net cash provided by (used for) investing activities	(194,584)	(138,812)
Capitalized debt issuance costs	(2,221)	(2,540)
Dividends paid	(22,345)	(13,359)
Proceeds from borrowings	248,818	0
Proceeds from exercise of stock options	6,627	5,323
Repayment of borrowings	(250,000)	0
Repurchase of common stock for treasury	(10,784)	(19)
Utilization of restricted cash	96,433	33,694
Net cash provided by (used for) financing activities	66,528	23,099
Net increase (decrease) in cash and cash equivalents	372,567	128,640
Cash and cash equivalents at beginning of period	825,901	630,299
Cash and cash equivalents at end of period	1,198,468	758,939
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	290,278	232,523
Depreciation and amortization	1,149	1,290
Deferred income taxes	(176)	(1,430)
Net changes in working capital and other	(310,163)	(255,859)
Net cash (used for) provided by operating activities	(18,912)	(23,476)
Proceeds from sales of equity securities	3
Net cash provided by (used for) investing activities	3	0
Intercompany financing	317,185	129,251
Capitalized debt issuance costs	(2,221)	(2,540)
Dividends paid	(22,345)	(13,359)
Proceeds from borrowings	248,818
Proceeds from exercise of stock options	6,627	5,323
Repayment of borrowings	(250,000)
Repurchase of common stock for treasury	(10,784)	(19)
Utilization of restricted cash	96,433	33,694
Net cash provided by (used for) financing activities	383,713	152,350
Net increase (decrease) in cash and cash equivalents	364,804	128,874
Cash and cash equivalents at beginning of period	803,320	611,158
Cash and cash equivalents at end of period	1,168,124	740,032
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	312,038	257,286
Depreciation and amortization	107,191	95,486
Deferred income taxes	3,932	21,010
Net changes in working capital and other	95,909	(104,494)
Net cash (used for) provided by operating activities	519,070	269,288
Additions to property, plant and equipment	(234,713)	(110,887)
Construction of assets pending sale-leaseback	(5,484)
Proceeds from disposition of assets	414	2,453
Proceeds from sales of equity securities	47,652
Purchase of investments	(2,961)	(29,877)
Settlements of derivative instruments	471	(331)
Net cash provided by (used for) investing activities	(194,621)	(138,642)
Intercompany financing	(321,273)	(129,158)
Net cash provided by (used for) financing activities	(321,273)	(129,158)
Net increase (decrease) in cash and cash equivalents	3,176	1,488
Cash and cash equivalents at beginning of period	2,517	53
Cash and cash equivalents at end of period	5,693	1,541
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(676)	(1,479)
Depreciation and amortization	2,410	2,757
Deferred income taxes	629	(145)
Net changes in working capital and other	(1,898)	(2,592)
Net cash (used for) provided by operating activities	465	(1,459)
Additions to property, plant and equipment	(750)	(936)
Proceeds from disposition of assets	21	3
Proceeds from repayment of loan to affiliate	763	763
Net cash provided by (used for) investing activities	34	(170)
Intercompany financing	4,088	(93)
Net cash provided by (used for) financing activities	4,088	(93)
Net increase (decrease) in cash and cash equivalents	4,587	(1,722)
Cash and cash equivalents at beginning of period	20,064	19,088
Cash and cash equivalents at end of period	24,651	17,366
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(311,362)	(255,807)
Net changes in working capital and other	$ 311,362	$ 255,807

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Guarantor Disclosures

9 Months Ended

Sep. 30, 2012

Guarantees [Abstract]

Guarantor Disclosures

Guarantor Disclosures

The Company’s payment obligations under the 2022 Notes are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 2022 Notes in excess of $5,000 (the “Guarantor Subsidiaries”). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation. These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the Guarantor Subsidiaries and the remaining subsidiaries that do not guarantee the 2022 Notes (the “Non-Guarantor Subsidiaries”), together with consolidating adjustments necessary to present the Company’s results on a consolidated basis.

Condensed Consolidating Financial Information as of September 30, 2012

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	1,168,124	$	5,693	$	24,651	$	—		$	1,198,468
Accounts receivable, net	19,803		1,685,259		5,480		(1,316,950		)	393,592
Inventories	—		357,780		13,757		—			371,537
Prepaid expenses and other    current assets	292		11,253		2,927		—			14,472
Deferred income taxes	430		19,085		221		—			19,736
Total current assets	1,188,649		2,079,070		47,036		(1,316,950		)	1,997,805
Property, plant and equipment, net	—		1,386,453		7,745		—			1,394,198
Equity investments	2,910,021		53,908		33,244		(2,952,999		)	44,174
Other assets, net	17,622		106,350		1,714		(17,689		)	107,997
Total assets	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174
Current liabilities
Accounts payable	$	1,314,329	$	179,772	$	11,073	$	(1,305,736	)	$	199,438
Accrued liabilities	15,640		157,906		1,037		(11,214		)	163,369
Total current liabilities	1,329,969		337,678		12,110		(1,316,950		)	362,807
Long-term debt	752,842		10,889		11,500		(11,500		)	763,731
Deferred income taxes	—		340,197		1,386		(6,189		)	335,394
Other liabilities	53		48,704		57		—			48,814
Stockholders’ equity	2,033,428		2,888,313		64,686		(2,952,999		)	2,033,428
Total liabilities and    stockholders’ equity	$	4,116,292	$	3,625,781	$	89,739	$	(4,287,638	)	$	3,544,174

Condensed Consolidating Financial Information as of December 31, 2011

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	803,320	$	2,517	$	20,064	$	—		$	825,901
Accounts receivable, net	—		1,384,705		949		(978,282		)	407,372
Inventories	—		478,229		12,548		—			490,777
Prepaid expenses and other    current assets	363		10,332		1,800		—			12,495
Deferred income taxes	430		19,049		132		—			19,611
Total current assets	804,113		1,894,832		35,493		(978,282		)	1,756,156
Property, plant and equipment, net	—		1,223,073		8,993		—			1,232,066
Equity investments	2,597,598		53,912		35,650		(2,640,419		)	46,741
Restricted cash	96,283		—		—		—			96,283
Other assets, net	17,650		132,968		2,467		(17,510		)	135,575
Total assets	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821
Current liabilities
Accounts payable	$	1,005,529	$	210,476	$	3,748	$	(992,719	)	$	227,034
Accrued liabilities	76		120,656		2,392		14,437			137,561
Total current liabilities	1,005,605		331,132		6,140		(978,282		)	364,595
Long-term debt	753,674		10,889		11,500		(11,500		)	764,563
Deferred income taxes	—		336,165		636		(6,010		)	330,791
Other liabilities	53		50,458		49		—			50,560
Stockholders’ equity	1,756,312		2,576,141		64,278		(2,640,419		)	1,756,312
Total liabilities and    stockholders’ equity	$	3,515,644	$	3,304,785	$	82,603	$	(3,636,211	)	$	3,266,821

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	809,164		$	13,876		$	(1,865	)	$	821,175
Cost of sales	—			638,892			11,969			(1,865		)	648,996
Gross profit	—			170,272			1,907			—			172,179
Selling, general and administrative    expenses	498			27,601			1,563			—			29,662
(Loss) income from operations	(498		)	142,671			344			—			142,517
Interest expense	(11,919		)	(15		)	—			—			(11,934		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	—			477			—			—			477
Other income (expense), net	4,556			(2,744		)	(590		)	—			1,222
(Loss) income before income taxes	(14,943		)	140,389			(246		)	—			125,200
(Benefit from) provision for income taxes	(4,498		)	42,596			138			—			38,236
Equity in net income of subsidiaries	97,409			—			—			(97,409		)	—
Net income (loss)	$	86,964		$	97,793		$	(384	)	$	(97,409	)	$	86,964
Comprehensive income	$	88,666		$	98,109		$	481		$	(98,590	)	$	88,666

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	956,390	$	12,708		$	(726	)	$	968,372
Cost of sales	—			810,516		11,515			(726		)	821,305
Gross profit	—			145,874		1,193			—			147,067
Selling, general and administrative    expenses	1,125			27,242		1,369			—			29,736
(Loss) income from operations	(1,125		)	118,632		(176		)	—			117,331
Interest expense	(12,727		)	—		—			—			(12,727		)
Other income (expense), net	1,396			950		(889		)	—			1,457
(Loss) income before income taxes	(12,456		)	119,582		(1,065		)	—			106,061
(Benefit from) provision for income taxes	(4,510		)	43,190		(549		)	—			38,131
Equity in net income of subsidiaries	75,876			—		—			(75,876		)	—
Net income (loss)	$	67,930		$	76,392	$	(516	)	$	(75,876	)	$	67,930
Comprehensive income (loss)	$	60,503		$	70,019	$	(1,570	)	$	(68,449	)	$	60,503

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,738,180		$	37,154		$	(5,334	)	$	2,770,000
Cost of sales	—			2,197,300			31,322			(5,334		)	2,223,288
Gross profit	—			540,880			5,832			—			546,712
Selling, general and administrative    expenses	1,500			81,288			4,804			—			87,592
(Loss) income from operations	(1,500		)	459,592			1,028			—			459,120
Interest expense	(35,652		)	(30		)	—			—			(35,682		)
Debt retirement costs	(7,082		)	—			—			—			(7,082		)
Gain from sales of equity securities	1			16,428			—			—			16,429
Other income (expense), net	12,044			(5,724		)	(2,644		)	—			3,676
(Loss) income before income taxes	(32,189		)	470,266			(1,616		)	—			436,461
(Benefit from) provision for income taxes	(11,105		)	158,228			(940		)	—			146,183
Equity in net income of subsidiaries	311,362			—			—			(311,362		)	—
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Comprehensive income	$	291,185		$	312,017		$	252		$	(312,269	)	$	291,185

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,731,248		$	32,331		$	(2,906	)	$	2,760,673
Cost of sales	—			2,251,296			30,537			(2,906		)	2,278,927
Gross profit	—			479,952			1,794			—			481,746
Selling, general and administrative    expenses	3,149			78,283			3,977			—			85,409
(Loss) income from operations	(3,149		)	401,669			(2,183		)	—			396,337
Interest expense	(38,403		)	(46		)	—			—			(38,449		)
Other income (expense), net	6,410			(2,090		)	(24		)	—			4,296
(Loss) income before income taxes	(35,142		)	399,533			(2,207		)	—			362,184
(Benefit from) provision for income taxes	(11,858		)	142,247			(728		)	—			129,661
Equity in net income of subsidiaries	255,807			—			—			(255,807		)	—
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Comprehensive income (loss)	$	225,981		$	251,474		$	(2,209	)	$	(249,265	)	$	225,981

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2012

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	290,278		$	312,038		$	(676	)	$	(311,362	)	$	290,278
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,149			107,191			2,410			—			110,750
Deferred income taxes	(176		)	3,932			629			—			4,385
Net changes in working capital    and other	(310,163		)	95,909			(1,898		)	311,362			95,210
Net cash (used for) provided by    operating activities	(18,912		)	519,070			465			—			500,623
Cash flows from investing activities
Additions to property, plant and    equipment	—			(234,713		)	(750		)	—			(235,463		)
Construction of assets pending    sale-leaseback	—			(5,484		)	—			—			(5,484		)
Proceeds from disposition of assets	—			414			21			—			435
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Proceeds from sales of equity securities	3			47,652			—			—			47,655
Purchase of investments	—			(2,961		)	—			—			(2,961		)
Settlements of derivative instruments	—			471			—			—			471
Net cash provided by (used for)    investing activities	3			(194,621		)	34			—			(194,584		)
Cash flows from financing activities
Intercompany financing	317,185			(321,273		)	4,088			—			—
Capitalized debt issuance costs	(2,221		)	—			—			—			(2,221		)
Dividends paid	(22,345		)	—			—			—			(22,345		)
Proceeds from borrowings	248,818			—			—			—			248,818
Proceeds from exercise of stock options	6,627			—			—			—			6,627
Repayment of borrowings	(250,000		)	—			—			—			(250,000		)
Repurchase of common stock for treasury	(10,784		)	—			—			—			(10,784		)
Utilization of restricted cash	96,433			—			—			—			96,433
Net cash provided by (used for)    financing activities	383,713			(321,273		)	4,088			—			66,528
Net increase in cash and cash equivalents	364,804			3,176			4,587			—			372,567
Cash and cash equivalents at beginning    of period	803,320			2,517			20,064			—			825,901
Cash and cash equivalents at end of period	$	1,168,124		$	5,693		$	24,651		$	—		$	1,198,468

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2011

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	232,523		$	257,286		$	(1,479	)	$	(255,807	)	$	232,523
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	1,290			95,486			2,757			—			99,533
Deferred income taxes	(1,430		)	21,010			(145		)	—			19,435
Net changes in working capital    and other	(255,859		)	(104,494		)	(2,592		)	255,807			(107,138		)
Net cash (used for) provided by    operating activities	(23,476		)	269,288			(1,459		)	—			244,353
Cash flows from investing activities
Additions to property, plant and equipment	—			(110,887		)	(936		)	—			(111,823		)
Proceeds from disposition of assets	—			2,453			3			—			2,456
Proceeds from repayment of loan    to affiliate	—			—			763			—			763
Purchase of investments	—			(29,877		)	—			—			(29,877		)
Settlements of derivative instruments	—			(331		)	—			—			(331		)
Net cash used for investing    activities	—			(138,642		)	(170		)	—			(138,812		)
Cash flows from financing activities
Intercompany financing	129,251			(129,158		)	(93		)	—			—
Capitalized debt issuance costs	(2,540		)	—			—			—			(2,540		)
Dividends paid	(13,359		)	—			—			—			(13,359		)
Proceeds from exercise of stock options	5,323			—			—			—			5,323
Repurchase of common stock for treasury	(19		)	—			—			—			(19		)
Utilization of restricted cash	33,694			—			—			—			33,694
Net cash provided by (used for)    financing activities	152,350			(129,158		)	(93		)	—			23,099
Net increase (decrease) in cash and    cash equivalents	128,874			1,488			(1,722		)	—			128,640
Cash and cash equivalents at beginning    of period	611,158			53			19,088			—			630,299
Cash and cash equivalents at end of period	$	740,032		$	1,541		$	17,366		$	—		$	758,939

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Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,394,198		$ 1,394,198		$ 1,232,066
Depreciation expense on property, plant and equipment	30,055	27,623	90,615	82,423
Sale-leaseback assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,484		$ 5,484

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Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2012			December 31, 2011
Trade customers	$	375,389		$	391,401
Affiliates	226			122
Allowance for doubtful accounts	(10,487		)	(10,969		)
	365,128			380,554
Federal and state taxes	13,151			16,113
Other	15,313			10,705
Accounts receivable, net	$	393,592		$	407,372

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Basis of Financial Statements

9 Months Ended

Sep. 30, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statements

Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2011 financial statements and notes thereto of Westlake Chemical Corporation (the “Company”) included in the annual report on Form 10-K for the fiscal year ended December 31, 2011, filed with the SEC on February 23, 2012. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2011.

In the opinion of the Company’s management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company’s financial position as of September 30, 2012, its results of operations for the three and nine months ended September 30, 2012 and 2011 and the changes in its cash position for the nine months ended September 30, 2012 and 2011.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the year ending December 31, 2012 or any other interim period. The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Recent Accounting Pronouncements

Fair Value Measurement

In May 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update changing some fair value measurement principles, such as by prohibiting the application of a blockage factor in fair value measurements and only requiring the application of the highest and best use concept when measuring nonfinancial assets. The accounting guidance requires, for recurring Level 3 fair value measurements, disclosure of quantitative information about unobservable inputs used, a description of the valuation processes used and a qualitative discussion about the sensitivity of the measurements. The accounting guidance further requires new disclosures about the use of a nonfinancial asset measured or disclosed at fair value if its use differs from its highest and best use. In addition, entities must report the fair value hierarchy level of assets and liabilities not recorded at fair value but where fair value is disclosed. The Company adopted the new fair value measurement guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

Presentation of Other Comprehensive Income

In June 2011, the FASB issued an accounting standards update on the presentation of other comprehensive income. The new accounting guidance eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity. The new standard allows companies to present net income and other comprehensive income either in one continuous statement or in two separate, but consecutive, statements. The FASB issued another accounting standards update on the presentation of other comprehensive income in December 2011, deferring the effective date for amendments to the presentation of reclassification adjustments of items out of accumulated other comprehensive income. In the interim, reclassifications out of accumulated other comprehensive income should be presented consistent with the current presentation requirements. All other requirements of the June 2011 accounting standards update are not affected by the December 2011 update. With the exception of the presentation of reclassification adjustments of items out of accumulated other comprehensive income, the Company adopted the guidance pertaining to the presentation of other comprehensive income as of January 1, 2012, and the adoption did not have an impact on the Company’s consolidated financial position or results of operations.

Testing Goodwill for Impairment

In September 2011, the FASB issued an accounting standards update to simplify how entities test goodwill for impairment. The new accounting guidance provides an entity with an option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test under current accounting guidance. If an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test. Also under this new accounting guidance, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test, but may resume performing the qualitative assessment in any subsequent period. The Company adopted the new goodwill impairment test guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

Disclosures about Offsetting Assets and Liabilities

In December 2011, the FASB issued an accounting standards update on disclosures for offsetting assets and liabilities. The new accounting guidance requires companies to disclose both gross and net information about (1) instruments and transactions eligible for offset in the statement of financial position, and (2) instruments and transactions subject to an agreement similar to a master netting arrangement. The accounting standards update will be effective for reporting periods beginning on or after January 1, 2013 and is not expected to have an impact on the Company’s consolidated financial position or results of operations.

Testing Indefinite-Lived Intangible Assets for Impairment

In July 2012, the FASB issued an accounting standards update to simplify how entities test indefinite-lived intangible assets for impairment and to improve consistency in impairment testing guidance among long-lived asset categories. The new accounting guidance provides an entity with an option to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test under current accounting guidance. If an entity concludes that it is not more likely than not that the indefinite-lived intangible asset is impaired, then the entity is not required to take further action. However, if an entity concludes otherwise, then it is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with current accounting guidance. Also under this new accounting guidance, an entity has the option to bypass the qualitative assessment for any indefinite-lived intangible asset in any period and proceed directly to performing the quantitative impairment test, but may resume performing the qualitative assessment in any subsequent period. The Company will adopt the new indefinite-lived intangible assets test guidance for the quarter ending March 31, 2013, but it is not expected to have a material impact on the Company's consolidated financial position or results of operations.

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Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	66,981,077	66,601,909
Common stock, held in treasury	284,493	69,816

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Earnings per Share

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The Company has unvested shares of restricted stock outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net income	$	86,964		$	67,930		$	290,278		$	232,523
Less:
Net income attributable to participating securities	(452		)	(598		)	(1,682		)	(2,087		)
Net income attributable to common shareholders	$	86,512		$	67,332		$	288,596		$	230,436

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Weighted average common shares—basic	66,311,958		66,012,102		66,240,225		65,919,892
Plus incremental shares from:
Assumed exercise of options	344,802		369,830		381,295		387,712
Weighted average common shares—diluted	66,656,760		66,381,932		66,621,520		66,307,604
Earnings per share:
Basic	$	1.30	$	1.02	$	4.36	$	3.50
Diluted	$	1.30	$	1.01	$	4.33	$	3.48

Excluded from the computation of diluted earnings per share are options to purchase 168,362 and 99,592 shares of common stock for the three months ended September 30, 2012 and 2011, respectively, and 293,062 and 151,923 shares of common stock for the nine months ended September 30, 2012 and 2011, respectively. These options were outstanding during the periods reported but were excluded because the option exercise price was greater than the average market price of the shares.

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Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Nov. 02, 2012
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Trading Symbol	WLK
Entity Registrant Name	WESTLAKE CHEMICAL CORP
Entity Central Index Key	0001262823
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		66,698,174

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Pension and Post-Retirement Benefit Costs

9 Months Ended

Sep. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Pension and Post-Retirement Benefit Costs

Pension and Post-Retirement Benefit Costs

Components of net periodic benefit cost are as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	Pension						Post-retirement Healthcare				Pension						Post-retirement Healthcare
	2012			2011			2012		2011		2012			2011			2012		2011
Service cost	$	250		$	224		$	2	$	4	$	754		$	705		$	7	$	12
Interest cost	645			681			185		209		1,936			2,042			555		628
Expected return on plan assets	(623		)	(570		)	—		—		(1,867		)	(1,709		)	—		—
Amortization of transition    obligation	—			—			—		28		—			—			—		85
Amortization of prior service    cost	74			74			21		47		223			223			63		140
Amortization of net loss	445			322			44		28		1,329			948			132		84
Net periodic benefit cost	$	791		$	731		$	252	$	316	$	2,375		$	2,209		$	757	$	949

The Company contributed $2,283 and $1,692 to the Salaried pension plan in the first nine months of 2012 and 2011, respectively, and contributed $1,542 and $1,362 to the Wage pension plan in the first nine months of 2012 and 2011, respectively. The Company expects to make additional contributions of $579 to the Salaried pension plan and $381 to the Wage pension plan during the year ending December 31, 2012.

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Net sales	$ 821,175	$ 968,372	$ 2,770,000	$ 2,760,673
Cost of sales	648,996	821,305	2,223,288	2,278,927
Gross profit	172,179	147,067	546,712	481,746
Selling, general and administrative expenses	29,662	29,736	87,592	85,409
Income (loss) from operations	142,517	117,331	459,120	396,337
Other income (expense)
Interest expense	(11,934)	(12,727)	(35,682)	(38,449)
Debt retirement costs	(7,082)	0	(7,082)	0
Gain from sales of equity securities	477	0	16,429	0
Other income, net	1,222	1,457	3,676	4,296
Income before income taxes	125,200	106,061	436,461	362,184
Provision for income taxes	38,236	38,131	146,183	129,661
Net income (loss)	$ 86,964	$ 67,930	$ 290,278	$ 232,523
Earnings per share:
Basic	$ 1.30	$ 1.02	$ 4.36	$ 3.50
Diluted	$ 1.30	$ 1.01	$ 4.33	$ 3.48
Weighted average shares outstanding:
Basic	66,311,958	66,012,102	66,240,225	65,919,892
Diluted	66,656,760	66,381,932	66,621,520	66,307,604
Dividends per common share	$ 0.1875	$ 0.0738	$ 0.3350	$ 0.2008

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Long-Term Debt

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

Long-term debt consists of the following:

	September 30, 2012		December 31, 2011
6 5/8% senior notes due 2016	$	—	$	249,674
3.60% senior notes due 2022	248,842		—
6 1/2% senior notes due 2029	100,000		100,000
6 3/4% senior notes due 2032	250,000		250,000
6 1/2% senior notes due 2035 (the “6 1/2% GO Zone Senior Notes Due 2035”)	89,000		89,000
6 1/2% senior notes due 2035 (the “6 1/2% IKE Zone Senior Notes Due 2035 ”)	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt	$	763,731	$	764,563

3.60% Senior Notes due 2022 and 6 ⁵/8% Senior Notes due 2016

On July 17, 2012, the Company issued $250,000 aggregate principal amount of its 3.60% senior notes due 2022 (the “2022 Notes”). On July 30, 2012, the Company voluntarily redeemed all $250,000 aggregate principal amount of its 6 ⁵/8% senior notes due 2016 (the “2016 Notes”) at a redemption price of 102.208% of the principal amount, plus accrued and unpaid interest to the redemption date. The Company used the net proceeds from the issuance of the 2022 Notes, plus cash on hand, to pay the redemption price of the 2016 Notes. As a result of the early redemption of the 2016 Notes, the Company recognized $7,082 in non-operating expense in the third quarter of 2012 consisting primarily of a pre-payment premium of $5,520 and a write-off of $1,277 in previously capitalized debt issuance costs.

The 2022 Notes are unsecured and were issued with an original issue discount of $1,183. There is no sinking fund and no scheduled amortization of the 2022 Notes prior to maturity. The Company may optionally redeem the 2022 Notes at any time and from time to time prior to April 15, 2022 (three months prior to the maturity date) for 100% of the principal plus accrued interest and a discounted "make whole" payment of remaining unpaid principal and interest payments. On or after April 15, 2022, the Company may optionally redeem the 2022 Notes for 100% of the principal plus accrued interest. The holders of the 2022 Notes may require the Company to repurchase the 2022 Notes at a price of 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase, upon the occurrence of both a “change of control” and, within 60 days of such change of control, a “below investment grade rating event” (as such terms are defined in the indenture governing the 2022 Notes). All domestic subsidiaries of the Company that guarantee other indebtedness of the Company or of another guarantor of the 2022 Notes in excess of $5,000 are guarantors of the 2022 Notes.

The indenture governing the 2022 Notes contains customary events of default and covenants that will restrict the Company's and certain of its subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of the Company's assets.

Revolving Credit Facility

The Company has a $400,000 senior secured revolving credit facility. At September 30, 2012, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of September 30, 2012, the Company had outstanding letters of credit totaling $16,214 and borrowing availability of $365,865 under the revolving credit facility.

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Other Assets

9 Months Ended

Sep. 30, 2012

Other Assets [Abstract]

Other Assets

Other Assets

There were no investments reflected in other assets, net in the consolidated balance sheet at September 30, 2012 as the Company completed the liquidation of its holdings of equity securities during the third quarter of 2012. Investments reflected in other assets, net at December 31, 2011 was $30,113. These investments in equity securities were classified as available-for-sale.

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale investments at December 31, 2011 were as follows:

	December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Available-for-sale equity securities	$	28,265	$	1,981	$	(133	)	$	30,113

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

_____________

As of December 31, 2011, an unrealized gain of $1,185, net of income tax expense of $663, was recorded in accumulated other comprehensive income. See Note 9 for the fair value hierarchy of the Company’s available-for-sale equity securities.

The proceeds from sales of available-for-sale equity securities and the gross realized gains included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Proceeds from sales of available-for-sale equity securities	$	1,628	$	—	$	47,655	$	—
Gross realized gains	$	477	$	—	$	16,429	$	—

Amortization expense on other assets of $8,717 and $5,664 is included in the consolidated statements of operations for the three months ended September 30, 2012 and 2011, respectively. Amortization expense on other assets of $20,135 and $17,110 is included in the consolidated statements of operations for the nine months ended September 30, 2012 and 2011, respectively.

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Basis of Financial Statements (Policies)

9 Months Ended

Sep. 30, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Fair Value Measurement

In May 2011, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update changing some fair value measurement principles, such as by prohibiting the application of a blockage factor in fair value measurements and only requiring the application of the highest and best use concept when measuring nonfinancial assets. The accounting guidance requires, for recurring Level 3 fair value measurements, disclosure of quantitative information about unobservable inputs used, a description of the valuation processes used and a qualitative discussion about the sensitivity of the measurements. The accounting guidance further requires new disclosures about the use of a nonfinancial asset measured or disclosed at fair value if its use differs from its highest and best use. In addition, entities must report the fair value hierarchy level of assets and liabilities not recorded at fair value but where fair value is disclosed. The Company adopted the new fair value measurement guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

Presentation of Other Comprehensive Income

In June 2011, the FASB issued an accounting standards update on the presentation of other comprehensive income. The new accounting guidance eliminates the option to report other comprehensive income and its components in the statement of changes in stockholders’ equity. The new standard allows companies to present net income and other comprehensive income either in one continuous statement or in two separate, but consecutive, statements. The FASB issued another accounting standards update on the presentation of other comprehensive income in December 2011, deferring the effective date for amendments to the presentation of reclassification adjustments of items out of accumulated other comprehensive income. In the interim, reclassifications out of accumulated other comprehensive income should be presented consistent with the current presentation requirements. All other requirements of the June 2011 accounting standards update are not affected by the December 2011 update. With the exception of the presentation of reclassification adjustments of items out of accumulated other comprehensive income, the Company adopted the guidance pertaining to the presentation of other comprehensive income as of January 1, 2012, and the adoption did not have an impact on the Company’s consolidated financial position or results of operations.

Testing Goodwill for Impairment

In September 2011, the FASB issued an accounting standards update to simplify how entities test goodwill for impairment. The new accounting guidance provides an entity with an option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test under current accounting guidance. If an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test. Also under this new accounting guidance, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test, but may resume performing the qualitative assessment in any subsequent period. The Company adopted the new goodwill impairment test guidance as of January 1, 2012, and the adoption did not have a material impact on the Company’s consolidated financial position or results of operations.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company is subject to environmental laws and regulations that can impose civil and criminal sanctions and that may require it to mitigate the effects of contamination caused by the release or disposal of hazardous substances into the environment. Under one law, an owner or operator of property may be held strictly liable for remediating contamination without regard to whether that person caused the contamination, and without regard to whether the practices that resulted in the contamination were legal at the time they occurred. Because several of the Company’s production sites have a history of industrial use, it is impossible to predict precisely what effect these legal requirements will have on the Company.

Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation (“Goodrich”) chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company’s operations. The soil and groundwater at the complex, which does not include the Company’s nearby PVC facility, had been extensively contaminated under Goodrich’s operations. In 1993, Goodrich spun off the predecessor of PolyOne Corporation (“PolyOne”), and that predecessor assumed Goodrich’s indemnification obligations relating to preexisting contamination.

In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties, incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company’s provision to or on behalf of PolyOne of certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex do not have a specified termination date but are expected to last for the foreseeable future. The costs incurred by PolyOne to provide the environmental remediation services were $3,287 in 2011. On March 17, 2010, the Company received notice of PolyOne’s intention to commence an arbitration proceeding under the settlement agreement. In this proceeding, PolyOne seeks to readjust the percentage allocation of costs and to recover approximately $1,400 from the Company in reimbursement of previously paid remediation costs. The arbitration is currently stayed.

Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky Environmental and Public Protection Cabinet (the “Cabinet”) re-issued Goodrich’s Resource Conservation and Recovery Act (“RCRA”) permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich’s clean-up obligations under the permit to the Company. The Company intervened in the proceedings. The Cabinet has suspended all corrective action under the RCRA permit in deference to a remedial investigation and feasibility study (“RIFS”) being conducted pursuant to an Administrative Settlement Agreement (“AOC”), which became effective on December 9, 2009. See “Change in Regulatory Regime” below. The proceedings have been postponed. Periodic status conferences will be held to evaluate whether additional proceedings will be required. On September 19, 2011, the Company filed a motion to dismiss the proceedings, which was denied on December 29, 2011.

Change in Regulatory Regime. In May 2009, the Cabinet sent a letter to the U.S. Environmental Protection Agency (“EPA”) requesting the EPA’s assistance in addressing contamination at the Calvert City site under the U.S. Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”). In its response to the Cabinet also in May 2009, the EPA stated that it concurred with the Cabinet’s request and would incorporate work previously conducted under the Cabinet’s RCRA authority into the EPA’s cleanup efforts under CERCLA. Since 1983, the EPA has been addressing contamination at an abandoned landfill adjacent to the Company’s plant which had been operated by Goodrich and which was being remediated pursuant to CERCLA. During the past two years, the EPA has directed Goodrich and PolyOne to conduct additional investigation activities at the landfill and at the Company’s plant. In June 2009, the EPA notified the Company that the Company may have potential liability under section 107(a) of CERCLA at its plant site. Liability under section 107(a) of CERCLA is strict and joint and several. The EPA also identified Goodrich and PolyOne, among others, as potentially responsible parties at the plant site. The Company negotiated, in conjunction with the other potentially responsible parties, the AOC and an order to conduct the RIFS. The parties submitted and received EPA approval for a RIFS work plan to implement the AOC. The parties are currently conducting the RIFS.

Monetary Relief. Except as noted above with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, none of the court, the Cabinet nor the EPA has established any allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. At this time, the Company is not able to estimate the loss or reasonable possible loss, if any, on the Company’s financial statements that could result from the resolution of these proceedings. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

EPA Audit of Ethylene Units in Lake Charles. During 2007, the EPA conducted an audit of the Company’s ethylene units in Lake Charles, Louisiana, with a focus on leak detection and repair, or LDAR. As a result of the audit, the EPA brought allegations that the Company had violated certain environmental laws and regulations pertaining to LDAR. The Company has agreed to settle this matter, subject to court approval, by paying a cash penalty of $500 and has recorded an accrual in such amount.

In addition to the matters described above, the Company is involved in various routine legal proceedings incidental to the conduct of its business. The Company does not believe that any of these routine legal proceedings will have a material adverse effect on its financial condition, results of operations or cash flows.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following tables summarize, by level within the fair value hierarchy, the Company’s assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2012
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,213	$	8,630		$	9,843
Risk management liabilities - Commodity forward contracts	—		(2,892		)	(2,892		)
Firm commitments
Hedged portion of firm commitment	—		1,019			1,019
Hedged portion of firm commitment	—		(8,630		)	(8,630		)
	December 31, 2011
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	1,090	$	1,347		$	2,437
Risk management liabilities - Commodity forward contracts	—		(4,235		)	(4,235		)
Firm commitments
Hedged portion of firm commitment	—		3,262			3,262
Marketable securities
Available-for-sale equity securities	30,113		—			30,113

The Level 2 measurements are derived using forward curves supplied by industry recognized and unrelated third-party services. There were no transfers in and out of Levels 1 and 2 of the fair value hierarchy for the nine months ended September 30, 2012 and 2011.

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company’s long-term debt are summarized in the table below. The Company’s long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company’s long-term debt. Because the Company’s long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company’s long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	September 30, 2012				December 31, 2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
6 5/8% senior notes due 2016	$	—	$	—	$	249,674	$	254,890
3.60% senior notes due 2022	248,842		253,738		—		—
6 1/2% senior notes due 2029	100,000		115,619		100,000		108,834
6 3/4% senior notes due 2032	250,000		288,515		250,000		263,988
6 1/2% GO Zone Senior Notes Due 2035	89,000		103,031		89,000		93,090
6 1/2% IKE Zone Senior Notes Due 2035	65,000		75,247		65,000		67,987
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

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Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting [Abstract]
Income from operations	$ 142,517	$ 117,331	$ 459,120	$ 396,337
Interest expense	(11,934)	(12,727)	(35,682)	(38,449)
Debt retirement costs	(7,082)	0	(7,082)	0
Gain from sales of equity securities	477	0	16,429	0
Other income, net	1,222	1,457	3,676	4,296
Income before income taxes	$ 125,200	$ 106,061	$ 436,461	$ 362,184

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Under the Westlake Chemical Corporation 2004 Omnibus Incentive Plan (the “2004 Plan”), all employees and nonemployee directors of the Company, as well as certain individuals who have agreed to become the Company’s employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2004 Plan. At the discretion of the administrator of the 2004 Plan, employees and nonemployee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards or cash awards (any of which may be a performance award). Total stock-based compensation expense related to the 2004 Plan was $1,515 and $1,636 for the three months ended September 30, 2012 and 2011, respectively, and $4,640 and $4,762 for the nine months ended September 30, 2012 and 2011, respectively.

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Derivative Instruments

9 Months Ended

Sep. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

For derivative instruments that are designated and qualify as fair value hedges, the gains or losses on the derivative instruments, as well as the offsetting losses or gains on the hedged items attributable to the hedged risk, were included in cost of sales in the consolidated statements of operations for the three and nine months ended September 30, 2012 and 2011. As of September 30, 2012, the Company had 53,550,000 gallons of feedstock forward contracts designated as fair value hedges.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in cost of sales in the consolidated statements of operations for the three and nine months ended September 30, 2012 and 2011.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

Interest Rate Risk Management

In order to manage its interest rate risk, the Company may enter into Treasury lock agreements to fix the Treasury yield component of the interest cost associated with anticipated financings and designate these Treasury locks as cash flow hedges.

During June and July 2012, the Company entered into several Treasury lock agreements to fix the Treasury yield component of the interest cost of financing the issuance of senior notes. The Company refinanced all $250,000 aggregate principal amount of the 2016 Notes through the issuance of $250,000 aggregate principal amount of the 2022 Notes in July 2012. Also in July 2012, the Company settled all Treasury lock agreements associated with the issuance of the 2022 Notes with an aggregate payment of $1,940 to the counterparties due to a decrease in the 10-year Treasury rates between inception and settlement of the Treasury lock agreements.

The fair values of derivative instruments in the Company’s consolidated balance sheets were as follows:

	Asset Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	8,630	$	—
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	1,213		2,437
Total asset derivatives		$	9,843	$	2,437

	Liability Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	1,019	$	3,262
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	1,873		973
Total liability derivatives		$	2,892	$	4,235

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company’s consolidated statements of operations. For the three and nine months ended September 30, 2012, there was no material ineffectiveness with regard to the Company’s qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Commodity forward contracts	Cost of sales	$	(515	)	$	(1,780	)	$	12,345		$	(1,780	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Firm commitment designated as the    hedged item	Cost of sales	$	515		$	1,780		$	(13,546	)	$	1,780

The following table reflects the impact of derivative instruments designated as cash flow hedges on the Company’s consolidated statements of operations for the three and nine months ended September 30, 2012.

Derivatives in Cash Flow    Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Three Months Ended September 30,					Nine Months Ended September 30,
		2012			2011		2012			2011
Treasury lock agreements	Interest expense	$	(813	)	$	—	$	(813	)	$	—

The impact of derivative instruments that have not been designated as hedges on the Company’s consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012			2011
Commodity forward contracts	Cost of sales	$	249	$	371	$	(783	)	$	838

See Note 9 for the fair value of the Company’s derivative instruments.

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Income Taxes

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective income tax rate was 33.5% for the nine months ended September 30, 2012. The effective income tax rate for the 2012 period was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, partially offset by state income taxes. The effective income tax rate was 35.8% for the nine months ended September 30, 2011. The effective income tax rate for the 2011 period was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

Management anticipates no material reductions to the total amount of unrecognized tax benefits within the next twelve months.

The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. As of September 30, 2012, the Company had no material accrued interest and penalties related to uncertain tax positions.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2005. In January 2012, the Internal Revenue Service completed the audit of the Company for the 2009 tax year with no assessment.

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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 821,175	$ 968,372	$ 2,770,000	$ 2,760,673
Cost of sales	648,996	821,305	2,223,288	2,278,927
Gross profit	172,179	147,067	546,712	481,746
Selling, general and administrative expenses	29,662	29,736	87,592	85,409
Income (loss) from operations	142,517	117,331	459,120	396,337
Interest expense	(11,934)	(12,727)	(35,682)	(38,449)
Debt retirement costs	(7,082)	0	(7,082)	0
Gain from sales of equity securities	477	0	16,429	0
Other income (expense), net	1,222	1,457	3,676	4,296
Income before income taxes	125,200	106,061	436,461	362,184
Provision for (benefit from) income taxes	38,236	38,131	146,183	129,661
Net income (loss)	86,964	67,930	290,278	232,523
Comprehensive income (loss)	88,666	60,503	291,185	225,981
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative expenses	498	1,125	1,500	3,149
Income (loss) from operations	(498)	(1,125)	(1,500)	(3,149)
Interest expense	(11,919)	(12,727)	(35,652)	(38,403)
Debt retirement costs	(7,082)		(7,082)
Gain from sales of equity securities			1
Other income (expense), net	4,556	1,396	12,044	6,410
Income before income taxes	(14,943)	(12,456)	(32,189)	(35,142)
Provision for (benefit from) income taxes	(4,498)	(4,510)	(11,105)	(11,858)
Equity in net income of subsidiaries	97,409	75,876	311,362	255,807
Net income (loss)	86,964	67,930	290,278	232,523
Comprehensive income (loss)	88,666	60,503	291,185	225,981
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	809,164	956,390	2,738,180	2,731,248
Cost of sales	638,892	810,516	2,197,300	2,251,296
Gross profit	170,272	145,874	540,880	479,952
Selling, general and administrative expenses	27,601	27,242	81,288	78,283
Income (loss) from operations	142,671	118,632	459,592	401,669
Interest expense	(15)	0	(30)	(46)
Gain from sales of equity securities	477		16,428
Other income (expense), net	(2,744)	950	(5,724)	(2,090)
Income before income taxes	140,389	119,582	470,266	399,533
Provision for (benefit from) income taxes	42,596	43,190	158,228	142,247
Net income (loss)	97,793	76,392	312,038	257,286
Comprehensive income (loss)	98,109	70,019	312,017	251,474
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	13,876	12,708	37,154	32,331
Cost of sales	11,969	11,515	31,322	30,537
Gross profit	1,907	1,193	5,832	1,794
Selling, general and administrative expenses	1,563	1,369	4,804	3,977
Income (loss) from operations	344	(176)	1,028	(2,183)
Other income (expense), net	(590)	(889)	(2,644)	(24)
Income before income taxes	(246)	(1,065)	(1,616)	(2,207)
Provision for (benefit from) income taxes	138	(549)	(940)	(728)
Net income (loss)	(384)	(516)	(676)	(1,479)
Comprehensive income (loss)	481	(1,570)	252	(2,209)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	(1,865)	(726)	(5,334)	(2,906)
Cost of sales	(1,865)	(726)	(5,334)	(2,906)
Equity in net income of subsidiaries	(97,409)	(75,876)	(311,362)	(255,807)
Net income (loss)	(97,409)	(75,876)	(311,362)	(255,807)
Comprehensive income (loss)	$ (98,590)	$ (68,449)	$ (312,269)	$ (249,265)

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Guarantor Disclosures (Condensed Consolidating Financial Information Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,198,468	$ 825,901	$ 758,939	$ 630,299
Accounts receivable, net	393,592	407,372
Inventories	371,537	490,777
Prepaid expenses and other current assets	14,472	12,495
Deferred income taxes	19,736	19,611
Total current assets	1,997,805	1,756,156
Property, plant and equipment, net	1,394,198	1,232,066
Equity investments	44,174	46,741
Restricted cash		96,283
Other assets, net	107,997	135,575
Total assets	3,544,174	3,266,821
Accounts payable	199,438	227,034
Accrued liabilities	163,369	137,561
Total current liabilities	362,807	364,595
Long-term debt	763,731	764,563
Deferred income taxes	335,394	330,791
Other liabilities	48,814	50,560
Stockholders' equity	2,033,428	1,756,312
Total liabilities and stockholders' equity	3,544,174	3,266,821
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	1,168,124	803,320	740,032	611,158
Accounts receivable, net	19,803
Prepaid expenses and other current assets	292	363
Deferred income taxes	430	430
Total current assets	1,188,649	804,113
Equity investments	2,910,021	2,597,598
Restricted cash		96,283
Other assets, net	17,622	17,650
Total assets	4,116,292	3,515,644
Accounts payable	1,314,329	1,005,529
Accrued liabilities	15,640	76
Total current liabilities	1,329,969	1,005,605
Long-term debt	752,842	753,674
Other liabilities	53	53
Stockholders' equity	2,033,428	1,756,312
Total liabilities and stockholders' equity	4,116,292	3,515,644
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5,693	2,517	1,541	53
Accounts receivable, net	1,685,259	1,384,705
Inventories	357,780	478,229
Prepaid expenses and other current assets	11,253	10,332
Deferred income taxes	19,085	19,049
Total current assets	2,079,070	1,894,832
Property, plant and equipment, net	1,386,453	1,223,073
Equity investments	53,908	53,912
Other assets, net	106,350	132,968
Total assets	3,625,781	3,304,785
Accounts payable	179,772	210,476
Accrued liabilities	157,906	120,656
Total current liabilities	337,678	331,132
Long-term debt	10,889	10,889
Deferred income taxes	340,197	336,165
Other liabilities	48,704	50,458
Stockholders' equity	2,888,313	2,576,141
Total liabilities and stockholders' equity	3,625,781	3,304,785
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	24,651	20,064	17,366	19,088
Accounts receivable, net	5,480	949
Inventories	13,757	12,548
Prepaid expenses and other current assets	2,927	1,800
Deferred income taxes	221	132
Total current assets	47,036	35,493
Property, plant and equipment, net	7,745	8,993
Equity investments	33,244	35,650
Other assets, net	1,714	2,467
Total assets	89,739	82,603
Accounts payable	11,073	3,748
Accrued liabilities	1,037	2,392
Total current liabilities	12,110	6,140
Long-term debt	11,500	11,500
Deferred income taxes	1,386	636
Other liabilities	57	49
Stockholders' equity	64,686	64,278
Total liabilities and stockholders' equity	89,739	82,603
Eliminations
Condensed Financial Statements, Captions [Line Items]
Accounts receivable, net	(1,316,950)	(978,282)
Total current assets	(1,316,950)	(978,282)
Equity investments	(2,952,999)	(2,640,419)
Other assets, net	(17,689)	(17,510)
Total assets	(4,287,638)	(3,636,211)
Accounts payable	(1,305,736)	(992,719)
Accrued liabilities	(11,214)	14,437
Total current liabilities	(1,316,950)	(978,282)
Long-term debt	(11,500)	(11,500)
Deferred income taxes	(6,189)	(6,010)
Stockholders' equity	(2,952,999)	(2,640,419)
Total liabilities and stockholders' equity	$ (4,287,638)	$ (3,636,211)

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Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Receivable, Net [Abstract]
Trade customers	$ 375,389	$ 391,401
Affiliates	226	122
Allowance for doubtful accounts	(10,487)	(10,969)
Receivables from trade customers and affiliates, net	365,128	380,554
Federal and state taxes	13,151	16,113
Other	15,313	10,705
Accounts receivable, net	$ 393,592	$ 407,372

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Income Taxes (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Effective income tax rate	33.50%	35.80%
U.S. federal statutory income tax rate	35.00%	35.00%

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Subsequent Events

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

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Other Assets (Tables)

9 Months Ended

Sep. 30, 2012

Other Assets [Abstract]

Available-For-Sale Investments

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale investments at December 31, 2011 were as follows:

	December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Available-for-sale equity securities	$	28,265	$	1,981	$	(133	)	$	30,113

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

Proceeds from Sales of Available-For-Sale Equity Securities and Gross Realized Gains Included in the Consolidated Statements of Operations

The proceeds from sales of available-for-sale equity securities and the gross realized gains included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Proceeds from sales of available-for-sale equity securities	$	1,628	$	—	$	47,655	$	—
Gross realized gains	$	477	$	—	$	16,429	$	—

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Fair Value Measurements (Summary of Assets and Liabilities Accounted at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities		$ 30,113
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Hedged portion of firm commitment	1,019	3,262
Hedged portion of firm commitment	(8,630)
Available-for-sale equity securities		30,113
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities		30,113
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Hedged portion of firm commitment	1,019	3,262
Hedged portion of firm commitment	(8,630)
Recurring | Commodity Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets	9,843	2,437
Risk management liabilities	(2,892)	(4,235)
Recurring | Commodity Forward Contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets	1,213	1,090
Recurring | Commodity Forward Contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets	8,630	1,347
Risk management liabilities	$ (2,892)	$ (4,235)

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Long-Term Debt (Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jul. 17, 2012 3.60% Senior Notes Due 2022	Sep. 30, 2012 3.60% Senior Notes Due 2022	Jul. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 31, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016	Sep. 30, 2012 6 5/8% Senior Notes Due 2016	Jul. 17, 2012 Prior to April 15, 2022 3.60% Senior Notes Due 2022	Jul. 17, 2012 On or after April 15, 2022 3.60% Senior Notes Due 2022
Debt Instrument [Line Items]
Senior notes, principal amount issued					$ 250,000
Stated interest rate					3.60%	3.60%	6.625%		6.625%	6.625%
Maturity					2022	2022	2016	2016		2016
Senior notes, principal amount redeemed							250,000
Senior notes, redemption price as percentage of principal amount							102.208%				100.00%	100.00%
Non-operating expense	7,082	0	7,082	0					7,082
Pre-payment premium									5,520
Write-off of debt issuance costs			1,277	0					1,277
Senior notes, original issue discount					1,183
Senior notes, repurchase price as percentage of principal amount upon change of control and below investment grade rating event					101.00%
Senior notes, maximum number of days from change of control for below investment grade rating event					60 days
Senior notes, minimum debt amount guaranteed by subsidiaries						$ 5,000

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Stockholders' Equity [Abstract]
Net income	$ 86,964	$ 67,930	$ 290,278	$ 232,523
Pension and other post-retirement benefits liability
Pension and other post-retirement reserves adjustment (excluding amortization)	72	0	142	0
Amortization of benefits liability	584	471	1,747	1,395
Income tax provision on pension and other post-retirement benefits liability	(252)	(185)	(725)	(548)
Foreign currency translation adjustments	865	(1,054)	928	(730)
Reclassification of net cash flow hedge losses to net income	521	0	0	0
Available-for-sale investments
Unrealized holding gains (losses) on investments	339	(6,659)	14,582	(6,659)
Income tax provision on unrealized holding gains	(121)	0	(5,229)	0
Reclassification of net realized gain to net income	(306)	0	(10,538)	0
Other comprehensive income (loss)	1,702	(7,427)	907	(6,542)
Comprehensive income	$ 88,666	$ 60,503	$ 291,185	$ 225,981

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Property, Plant and Equipment

9 Months Ended

Sep. 30, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

As of September 30, 2012, the Company had property, plant and equipment totaling $1,394,198. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Construction of assets pending sale-leaseback included in property, plant and equipment, net in the consolidated balance sheet at September 30, 2012 was $5,484 and pertained to the construction of transportation equipment.

Depreciation expense on property, plant and equipment of $30,055 and $27,623 is included in cost of sales in the consolidated statements of operations for the three months ended September 30, 2012 and 2011, respectively. Depreciation expense on property, plant and equipment of $90,615 and $82,423 is included in cost of sales in the consolidated statements of operations for the nine months ended September 30, 2012 and 2011, respectively.

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Segment Information (Additional Information) (Detail)	9 Months Ended
	Sep. 30, 2012 Segment
Segment Reporting [Abstract]
Number of segments	2

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Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Schedule Of Long-Term Debt

Long-term debt consists of the following:

	September 30, 2012		December 31, 2011
6 5/8% senior notes due 2016	$	—	$	249,674
3.60% senior notes due 2022	248,842		—
6 1/2% senior notes due 2029	100,000		100,000
6 3/4% senior notes due 2032	250,000		250,000
6 1/2% senior notes due 2035 (the “6 1/2% GO Zone Senior Notes Due 2035”)	89,000		89,000
6 1/2% senior notes due 2035 (the “6 1/2% IKE Zone Senior Notes Due 2035 ”)	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt	$	763,731	$	764,563

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Other Assets (Available-for-sale Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Other Assets [Abstract]
Available-for-sale equity securities, Cost	$ 28,265
Available-for-sale equity securities, Gross Unrealized Gains	1,981
Available-for-sale equity securities, Gross Unrealized Losses	(133)	[1]
Available-for-sale equity securities, Fair Value	$ 30,113

[1] All unrealized loss positions were held at a loss for less than 12 months.

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Segment Information

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates in two principal business segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net external sales
Olefins
Polyethylene	$	431,614		$	444,077		$	1,275,057		$	1,358,631
Ethylene, styrene and other	108,171			251,597			669,718			587,438
Total Olefins	539,785			695,674			1,944,775			1,946,069
Vinyls
PVC, caustic soda and other	191,310			198,046			569,316			583,214
Building products	90,080			74,652			255,909			231,390
Total Vinyls	281,390			272,698			825,225			814,604
	$	821,175		$	968,372		$	2,770,000		$	2,760,673
Intersegment sales
Olefins	$	76,771		$	109,140		$	247,671		$	327,584
Vinyls	391			376			1,167			1,100
	$	77,162		$	109,516		$	248,838		$	328,684
Income (loss) from operations
Olefins	$	124,452		$	105,353		$	409,550		$	383,376
Vinyls	24,059			16,123			67,724			23,565
Corporate and other	(5,994		)	(4,145		)	(18,154		)	(10,604		)
	$	142,517		$	117,331		$	459,120		$	396,337
Depreciation and amortization
Olefins	$	27,070		$	21,746		$	74,903		$	64,998
Vinyls	11,232			10,967			34,330			32,782
Corporate and other	122			148			368			464
	$	38,424		$	32,861		$	109,601		$	98,244

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Other income (expense), net
Olefins	$	806		$	949		$	2,764		$	2,033
Vinyls	146			(303		)	115			179
Corporate and other	270			811			797			2,084
	$	1,222		$	1,457		$	3,676		$	4,296
Provision for (benefit from) income taxes
Olefins	$	36,092		$	34,867		$	130,612		$	128,405
Vinyls	6,556			5,277			18,989			5,847
Corporate and other	(4,412		)	(2,013		)	(3,418		)	(4,591		)
	$	38,236		$	38,131		$	146,183		$	129,661
Capital expenditures
Olefins	$	46,867		$	26,570		$	92,168		$	59,969
Vinyls	47,001			15,447			139,836			50,454
Corporate and other	1,027			628			3,459			1,400
	$	94,895		$	42,645		$	235,463		$	111,823

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Income from operations	$	142,517		$	117,331		$	459,120		$	396,337
Interest expense	(11,934		)	(12,727		)	(35,682		)	(38,449		)
Debt retirement costs	(7,082		)	—			(7,082		)	—
Gain from sales of equity securities	477			—			16,429			—
Other income, net	1,222			1,457			3,676			4,296
Income before income taxes	$	125,200		$	106,061		$	436,461		$	362,184

	September 30, 2012		December 31, 2011
Total assets
Olefins	$	1,355,157	$	1,441,752
Vinyls	956,665		824,825
Corporate and other	1,232,352		1,000,244
	$	3,544,174	$	3,266,821