| 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 | ||||||||||||
| DaVinci Roofscapes, L.L.C. | Kansas | DaVinci Roofscapes, L.L.C. | ||||||||||||
| Eagle Natrium LLC | Delaware | Eagle Natrium LLC | ||||||||||||
| Eagle Spinco Inc. | Delaware | Eagle Spinco Inc. | ||||||||||||
| Eagle US 2 LLC | Delaware | Eagle US 2 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./Groupe Royal, Inc. | Canada | Royal Group, Inc., Groupe Royal, Inc. Produits de Bâtiment Royal, Royal Building Products, Royal Building Solutions, Roytec Vinyl and NAPCO Royal Pipe & Fittings | ||||||||||||
| 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 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 Germany GmbH & Co. KG | Germany | Westlake Germany GmbH & Co. KG | ||||||||||||
| 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 International Services Corporation | Delaware | Westlake International Services Corporation | ||||||||||||
| 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 Polymers LLC | Delaware | Westlake Polymers LLC | ||||||||||||
| 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 | ||||||||||||