BOSTON BRUSSELS CHARLOTTE FRANKFURT HARRISBURG HARTFORD LONDON LUXEMBOURG MUNICH NEW YORK NEWPORT BEACH PALO ALTO PARIS PHILADELPHIA PRINCETON SAN FRANCISCO WASHINGTON | | August 12, 2005 Constar International Inc. One Crown Way Philadelphia, PA 19154 Subsidiary Guarantors c/o Constar International Inc. One Crown Way Philadelphia, PA 19154 Re: Form S-4 Registration Statement (Reg. No. 333-124731) Gentlemen and Ladies: We have acted as special counsel to Constar International Inc., a Delaware corporation (the “Company”), Constar, Inc., a Pennsylvania corporation (“Constar, Inc.”), BFF Inc., a Delaware corporation (“BFF”), DT, Inc., a Delaware corporation (“DT”), Constar Foreign Holdings, Inc., a Delaware corporation (“Foreign Holdings,” and together with Constar, Inc., BFF and DT, the “Domestic Guarantors”), and Constar International U.K. Limited, a company organized under the laws of England and Wales (“Constar U.K.,” and together with the Domestic Guarantors, the “Subsidiary Guarantors”), in connection with the preparation and filing of a Registration Statement on Form S-4 (Registration No. 333-124731) with the Securities and Exchange Commission (the “SEC”), (the “Registration Statement”), for the purpose of registering the issuance of up to an aggregate principal amount of $220,000,000 of the Company’s Senior Secured Floating Rate Notes due 2012 (the “New Notes”) and the guarantees thereof by the Subsidiary Guarantors (the “New Guarantees”) under the Securities Act of 1933, as amended (the “Securities Act”). The New Notes and the New Guarantees are to be issued in exchange for an equal aggregate principal amount of the Company’s outstanding Senior Secured Floating Rate Notes due 2012 (the “Old Notes”), and the guarantees thereof by the Subsidiary Guarantors (the “Old Guarantees”), pursuant to a Registration Rights Agreement dated as of February 11, 2005 (the “Registration Rights Agreement”), by and among the Company, the Subsidiary Guarantors, Citigroup Global Markets Inc. and Credit Suisse First Boston LLC, as Initial Purchasers, which is filed as Exhibit 4.2 to the Registration Statement (the “Exchange Offer”). The New Notes and the New Guarantees are to be issued pursuant to the terms of an Indenture dated as of February 11, 2005 (the “Indenture”), by and among the Company, the Subsidiary Guarantors and The Bank of New York (the “Trustee”), which is filed as Exhibit 4.1 to the Registration Statement. The Indenture is to be qualified under the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”). We have participated in the preparation of the Registration Statement and have made such legal and factual examination and inquiry as we have deemed advisable for the rendering of |