EXHIBIT 21

SUBSIDIARIES OF WESTLAKE *

Name of Subsidiary	State or Other Jurisdiction of Incorporation or Organization	Names Doing Business
Axiall Canada, Inc.	Canada	Axiall Canada, Inc.
Axiall Corporation	Delaware	Axiall Corporation
Axiall Holdco, Inc.	Delaware	Axiall Holdco, Inc.
Axiall Limited Partnership	Ontario	Axiall Limited Partnership
Axiall Noteco, Inc.	Delaware	Axiall Noteco, Inc.
Axiall Taiwan Ltd.	Taiwan	Axiall Taiwan Ltd.
Axiall, LLC	Delaware	Axiall, LLC
Eagle Natrium LLC	Delaware	Eagle Natrium LLC
Eagle Spinco Inc.	Delaware	Eagle Spinco Inc.
Eagle US 2 LLC	Delaware	Eagle US 2 LLC
Lagoon LLC	Delaware	Lagoon LLC
North American Pipe Corporation	Delaware	North American Pipe Corporation    and NAPCO
North American Specialty Products LLC	Delaware	North American Specialty Products LLC
Plastic Trends, Inc.	Michigan	Plastic Trends, Inc.
Rome Acquisition Holding Corp.	Nova Scotia	Rome Acquisition Holding Corp.
Rome Delaware Corp.	Delaware	Rome Delaware Corp.
Royal Building Products (USA) Inc.	Delaware	Royal Building Products (USA) Inc.
Royal Group, Inc.	Canada	Royal Group, Inc.
Taiwan Chlorine Industries Ltd.	Taiwan	Taiwan Chlorine Industries Ltd.
Vinnolit Benelux-France B.V.B.A.	Dendermonde, Belgium	Vinnolit Benelux-France B.V.B.A.
Vinnolit GmbH & Co. KG	Ismaning, Germany	Vinnolit GmbH & Co. KG
Vinnolit Holdings GmbH	Ismaning, Germany	Vinnolit Holdings GmbH
Vinnolit Italia S.r.L.	Milan, Italy	Vinnolit Italia S.r.L.
Vinnolit Limited	United Kingdom	Vinnolit Limited
Vinnolit Monomer Geschäftsführungs GmbH	Ismaning, Germany	Vinnolit Monomer Geschäftsführungs GmbH
Vinnolit Schkopau GmbH	Ismaning, Germany	Vinnolit Schkopau GmbH
Vinnolit Treuhand GmbH	Ismaning, Germany	Vinnolit Treuhand GmbH
Westlake Chemical Finance Corporation	Delaware	Westlake Chemical Finance Corporation
Westlake Chemical Investments, Inc.	Delaware	Westlake Chemical Investments, 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 Compounds LLC	Delaware	Westlake Compounds LLC

Westlake Development Corporation	Delaware	Westlake Development Corporation
Westlake International Holdings Cooperatief U.A.	The Netherlands	Westlake International Holdings Cooperatief U.A.
Westlake International Holdings II C.V.	The Netherlands	Westlake International Holdings II C.V.
Westlake International I B.V.	The Netherlands	Westlake International I B.V.
Westlake Longview Corporation	Delaware	Westlake Longview Corporation
Westlake Management Services, Inc.	Delaware	Westlake Management Services, Inc.
Westlake Olefins LLC	Delaware	Westlake Olefins LLC
Westlake Petrochemicals LLC	Delaware	Westlake Petrochemicals LLC,    Westlake Petrochemicals LP and WPE
Westlake Polymers LLC	Delaware	Westlake Polymers LLC,    Westlake Polymers LP and WPE
Westlake Styrene LLC	Delaware	Westlake Styrene LLC
Westlake Switzerland GmbH	Switzerland	Westlake Switzerland GmbH
Westlake Vinyls Company LP	Delaware	Westlake Vinyls Company LP
Westlake Vinyl Corporation	Delaware	Westlake Vinyl Corporation
Westlake Vinyls, Inc.	Delaware	Westlake Vinyls, Inc.
WPT LLC	Delaware	WPT LLC and WPT LP

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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.