Westlake (formerly known as Westlake Chemical) is a manufacturer and supplier of chemicals, polymers, and building products. It operates in two segments: Performance and Essential Materials and Housing and Infrastructure Products. The Performance and Essential Materials segment produces ethylene, polyethylene, styrene, chlor-alkali, chlorinated derivative products, ethylene dichloride, and other materials. The Housing and Infrastructure segment provides polyvinyl chloride products and services, including siding, trim and moldings, windows, decking, films, wallcoverings, polymer composite and cement roof tiles, matting, dock edging, etc. The company caters to medical, consumer, automotive, marine, and other industries.