EXHIBIT 99.1


                         WESTLAKE CHEMICAL CORPORATION

                 LETTER TO DEPOSITORY TRUST COMPANY PARTICIPANTS
                          FOR TENDER OF ALL OUTSTANDING
                          8 3/4% SENIOR NOTES DUE 2011
                           IN EXCHANGE FOR REGISTERED
                          8 3/4% SENIOR NOTES DUE 2011

  FULLY AND UNCONDITIONALLY GUARANTEED BY ALL DOMESTIC RESTRICTED SUBSIDIARIES
                        OF WESTLAKE CHEMICAL CORPORATION

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  THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON JANUARY 7,
  2004, UNLESS EXTENDED. OUTSTANDING NOTES TENDERED IN THE EXCHANGE OFFER MAY BE
  WITHDRAWN AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE
  EXPIRATION DATE.
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To Depository Trust Company Participants:

         We are enclosing with this letter the materials listed below relating
to the offer by Westlake Chemical Corporation to exchange its 8 3/4% Senior
Notes due 2011 fully and unconditionally guaranteed by all of its domestic
restricted subsidiaries (the "New Notes"), the issuance of which has been
registered under the Securities Act of 1933, for a like principal amount of its
issued and outstanding unregistered 8 3/4% Senior Notes due 2011 fully and
unconditionally guaranteed by all of its domestic restricted subsidiaries (the
"Old Notes"), upon the terms and subject to the conditions set forth in
Westlake's prospectus dated [__________], 2003 and the related letter of
transmittal.

         We are enclosing copies of the following documents:

         1. Prospectus dated [__________], 2003;

         2. Letter of transmittal, together with accompanying Substitute Form
W-9 Guidelines;

         3. Notice of guaranteed delivery; and

         4. Letter that may be sent to your clients for whose account you hold
Old Notes in your name or in the name of your nominee, with space provided for
obtaining that client's instruction with regard to the exchange offer.

         We urge you to contact your clients promptly. Please note that the
exchange offer will expire at 5:00 p.m., New York City time, on January 7, 2004,
unless extended.

         The exchange offer is not conditioned upon any minimum aggregate
principal amount of Old Notes being tendered for exchange.

         Pursuant to the letter of transmittal, each holder of Old Notes will
represent to Westlake and the guarantors that:

         o        any New Notes received are being acquired in the ordinary
                  course of business of the person receiving such New Notes;

         o        such person does not have an arrangement or understanding with
                  any person to participate in the distribution of the Old Notes
                  or the New Notes within the meaning of the Securities Act;

         o        such person is not an "affiliate," as defined in Rule 405
                  under the Securities Act, of Westlake or any guarantor, or, if
                  it is such an affiliate, it will comply with the registration
                  and prospectus delivery requirements of the Securities Act to
                  the extent applicable;




         o        if such person is not a broker-dealer, it is not engaged in,
                  and does not intend to engage in, a distribution of New Notes;

         o        if such person is a broker-dealer, it will receive New Notes
                  for its own account in exchange for Old Notes that were
                  acquired as a result of market-making activities or other
                  trading activities, and it will deliver a prospectus in
                  connection with any resale of such New Notes; however, by so
                  acknowledging and by delivering a prospectus, it will not be
                  deemed to admit that it is an "underwriter" within the meaning
                  of the Securities Act;

         o        if such person is a broker-dealer, it did not purchase the Old
                  Notes to be exchanged for the New Notes from Westlake or any
                  guarantor; and

         o        such person is not acting on behalf of any person who could
                  not truthfully and completely make the foregoing
                  representations.

         The enclosed Letter to Clients contains an authorization by the
beneficial owners of the Old Notes for you to make the foregoing
representations.

         Westlake will not pay any fee or commission to any broker or dealer or
to any other person (other than the Exchange Agent) in connection with the
solicitation of tenders of Old Notes under the exchange offer. Westlake will pay
or cause to be paid any transfer taxes payable on the transfer of Old Notes to
it, except as otherwise provided in Instruction 7 of the enclosed letter of
transmittal.

         Additional copies of the enclosed materials may be obtained from us
upon request.

                                         Very truly yours,

                                         JPMORGAN CHASE BANK




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