VSI membership is composed of manufacturers of vinyl and other polymeric siding and suppliers to the industry.

Click here to find out how to become a VSI member.

VSI Member Company List

*Manufacturer Members indicated with Asterisk.

• Akdeniz Chemson Additives Inc.
• American Original Building Products LLC*
• Americhem, Inc.
• Associated Materials, LLC*
• Atlas Material Testing Technology LLC
• CertainTeed LLC*
• Chemical Market Analytics by OPIS, a Dow Jones company
• Cornerstone Building Brands*
• Derby Building Products, Inc.*
• Formosa Plastics Corp. USA
• Galata Chemicals, LLC
• Holland Colours Americas Inc.
• INEOS Styrolution America, LLC
• Intertek
• Kaneka North America LLC
• Lanier Color Company, Inc.
• LG Chem America
• Norac, Inc.
• Oxy Vinyls LP
• Penn Color, Inc.
• Progressive Foam Technologies, Inc.
• ProVia*
• Return Polymers
• Shintech Inc.
• Shepherd Color
• Style Crest, Inc.*
• Westlake Chemical Corporation
• Westlake Royal Building Products*