Exhibit 5.1

BEIJING BRUSSELS CENTURY CITY HONG KONG LONDON LOS ANGELES NEWPORT BEACH	Times Square Tower 7 Times Square New York, New York 10036 TELEPHONE (212) 326-2000 FACSIMILE (212) 326-2061 www.omm.com	SAN FRANCISCO SHANGHAI SILICON VALLEY SINGAPORE TOKYO WASHINGTON, D.C.

April 27, 2010

Hexion U.S. Finance Corp.

180 East Broad Street

Columbus, OH 43215

Hexion Nova Scotia Finance, ULC

180 East Broad Street

Columbus, OH 43215

Re: Registration of Securities of Hexion U.S. Finance Corp. and Hexion Nova Scotia Finance, ULC

Ladies and Gentlemen:

At your request, we have examined the Registration Statement on Form S-4 (the “Registration Statement”), of Hexion U.S. Finance Corp., a Delaware corporation, and Hexion Nova Scotia Finance, ULC, a Nova Scotia unlimited liability company, (each an “Issuer”, and together, the “Issuers”), in connection with the Issuers’ offer to exchange up to $1,000,000,000 aggregate principal amount of the Issuers’ 8.875% Senior Secured Notes due 2018, which have been registered under the Securities Act of 1933 (the “Exchange Notes”), for a like principal amount of the Issuers’ outstanding 8.875% Senior Secured Notes due 2018 (the “Old Notes”), with the Exchange Notes to be guaranteed (the “Guarantees”) by each of the parties listed on Schedule I attached hereto (each a “Guarantor” and collectively, the “Guarantors”).

We have examined originals or copies, certified or otherwise identified to our satisfaction, of such documents, corporate and unlimited liability company records, certificates of public officials and other instruments as we have deemed necessary or advisable for the purpose of rendering this opinion.

On the basis of such examination, our reliance upon the assumptions in this opinion and our consideration of those questions of law we considered relevant, and subject to the limitations and qualifications in this opinion, we are of the opinion that:

1. Assuming the due authorization by Hexion Nova Scotia Finance, ULC, when issued, executed, delivered and authenticated in accordance with the terms of the Registered Exchange Offer and the Indenture (each as defined in the Registration Rights Agreement dated as of January 29, 2010, among the Issuers, Hexion Specialty Chemicals, Inc. and Credit Suisse Securities (USA) LLC, as representative of the Initial Purchasers (as defined therein)), the Exchange Notes will be the legally valid and binding obligations of the Issuers, enforceable against the Issuers in accordance with their terms, except as may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws relating to or affecting creditors’ rights generally (including, without limitation, fraudulent conveyance laws) and by general principles of equity including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance or injunctive relief, regardless of whether considered in a proceeding in equity or at law and possible judicial action giving effect to governmental actions or foreign laws affecting creditors’ rights generally.

Hexion U.S. Finance Corp.

Hexion Nova Scotia Finance, ULC

April 27, 2010

Page 2

2. Assuming due authorization of the Guarantees by Hexion Specialty Chemicals Inc., when the Exchange Notes have been issued, executed and authenticated in accordance with the terms of the Registered Exchange Offer and the Indenture, the Guarantees of each Guarantor with respect to the Exchange Notes will be the legally valid and binding obligation of such Guarantor, enforceable against such Guarantor, as the case may be, in accordance with their terms, except as may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws relating to or affecting creditors’ rights generally (including, without limitation, fraudulent conveyance laws), the effect of the eighth article of the certificate of incorporation of Lawter International Inc., and by general principles of equity including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance or injunctive relief, regardless of whether considered in a proceeding in equity or at law and possible judicial action giving effect to governmental actions or foreign laws affecting creditors’ rights generally.

With respect to the opinions in paragraphs 1 and 2, relating to matters of due authorization of the Exchange Notes and the Guarantees, we have assumed the matters set forth in paragraphs 2 and 3 in the opinions of Stewart McKelvey and Connell Foley LLP, as applicable, each dated the date hereof, a copy of each of which has been delivered to you by such other counsel.

Hexion U.S. Finance Corp.

Hexion Nova Scotia Finance, ULC

April 27, 2010

Page 3

The law governed by this opinion is limited to the present federal law of the United States, the present law of the State of New York, and the present General Corporation Law of the State of Delaware. We express no opinion as to the laws of any other jurisdiction and no opinion regarding the statutes, administrative decisions, rules, regulations or requirements of any county, municipality, subdivision or local authority or any jurisdiction.

We hereby consent to the use of this opinion as an exhibit to the Registration Statement and to the reference to this firm under the heading “Legal Matters” in the Prospectus constituting part of the Registration Statement. In giving this consent, we do not thereby admit that we are included in the category of persons whose consent is required under Section 7 of the Securities Act of 1933 or the rules and regulations promulgated thereunder.

Respectfully submitted,

         /s/ O’Melveny & Myers LLP

SCHEDULE I

GUARANTORS

Name	State of Incorporation / Organization
Hexion Specialty Chemicals, Inc.	New Jersey
Borden Chemical Investments, Inc.	Delaware
Borden Chemical Foundry, LLC	Delaware
HSC Capital Corporation	Delaware
Lawter International Inc.	Delaware
Borden Chemical International, Inc.	Delaware
Oilfield Technology Group, Inc.	Delaware
Hexion CI Holding Company (China) LLC	Delaware