EXHIBIT 21

SUBSIDIARIES OF WESTLAKE CORPORATION *

Name of Subsidiary	State or Other Jurisdiction of Incorporation or Organization	Names Doing Business
Eagle Spinco Inc.	Delaware	Eagle Spinco Inc.
Rome Delaware Corp.	Delaware	Rome Delaware Corp.
Taiwan Chlorine Industries Ltd.	Kaohsiung, Taiwan	Taiwan Chlorine Industries Ltd.
Vinnolit Monomer Geschäftsführungs GmbH	Ismaning, Germany	Vinnolit Monomer Geschäftsführungs GmbH
Westlake Canada Inc.	Toronto, Canada	Westlake Pipe & Fittings, Westlake Royal Building Products, Royal Building
Westlake Chemical Canada Inc.	Montreal, Canada	Westlake Chemical Canada Inc.
Westlake Chemical OpCo LP	Delaware	Westlake Chemical OpCo LP
Westlake Chemical Partners GP LLC	Delaware	Westlake Chemical Partners GP LLC
Westlake Chemical Partners LP	Delaware	Westlake Chemical Partners LP
Westlake Chemicals & Vinyls LLC	Delaware	Westlake Chemicals & Vinyls LLC
Westlake Compounds LLC	Delaware	Westlake Compounds LLC
Westlake DaVinci Roofscapes, L.L.C.	Delaware	Westlake DaVinci Roofscapes, L.L.C.
Westlake Dimex LLC	Delaware	Westlake Dimex LLC
Westlake Epoxy B.V.	Rotterdam, The Netherlands	Westlake Epoxy B.V.
Westlake Epoxy GmbH	Duisburg, Germany	Westlake Epoxy GmbH
Westlake Epoxy Inc.	Delaware	Westlake Epoxy Inc.
Westlake Germany GmbH & Co. KG	Ismaning, Germany	Westlake Germany GmbH & Co. KG
Westlake International I B.V.	Rotterdam, The Netherlands	Westlake International I B.V.
Westlake Longview Corporation	Delaware	Westlake Longview Corporation
Westlake Management  (Shanghai) Co., Ltd.	Shanghai, China	Westlake Management  (Shanghai) Co., Ltd.
Westlake Management Services, Inc.	Delaware	Westlake Management Services, Inc.
Westlake Natrium LLC	Delaware	Westlake Eagle Natrium LLC
Westlake Petrochemicals LLC	Delaware	Westlake Petrochemicals LLC
Westlake Pipe & Fittings Corporation	Delaware	Westlake Pipe and Fittings Corporation
Westlake Polymers LLC	Delaware	Westlake Polymers LLC
Westlake Royal Building Products (USA) Inc.	Delaware	Westlake Royal Building Products (USA) Inc.
Westlake Royal Building Products Inc.	Delaware	Westlake Royal Building Products Inc.
Westlake Royal Roofing LLC	Delaware	Westlake Royal Roofing LLC
Westlake Royal Stone LLC	Delaware	Westlake Royal Stone LLC
Westlake Royal Windows LLC	Delaware	Westlake Royal Windows LLC
Westlake Styrene LLC	Delaware	Westlake Styrene LLC
Westlake Switzerland GmbH	Baas, Switzerland	Westlake Switzerland GmbH
Westlake US 2 LLC	Delaware	Westlake US 2 LLC

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Westlake Vinnolit Benelux-France B.V.	Dendermonde, Belgium	Westlake Vinnolit Benelux-France B.V.
Westlake Vinnolit GmbH & Co. KG	Ismaning, Germany	Westlake Vinnolit GmbH & Co. KG
Westlake Vinnolit Holdings GmbH	Ismaning, Germany	Westlake Vinnolit Holdings GmbH
Westlake Vinnolit Italia S.r.L.	Milan, Italy	Westlake Vinnolit Italia S.r.L.
Westlake Vinnolit Limited	Runcorn, United Kingdom	Westlake Vinnolit Limited
Westlake Vinnolit Treuhand GmbH	Ismaning, Germany	Westlake Vinnolit Treuhand GmbH
Westlake Vinyls Company LP	Delaware	Westlake Vinyls Company LP
Westlake Vinyls, Inc.	Delaware	Westlake Vinyls, Inc.
WPT LLC	Delaware	WPT LLC

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*    Westlake has elected to omit the names of certain subsidiaries. None of the omitted subsidiaries, considered either alone or together with the other omitted subsidiaries of its immediate parent, constitutes a “Significant Subsidiary” as set forth in Section 601(b)(21) of Regulation S-K.

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