Westlake Chemical operates as a manufacturer and marketer of basic chemicals, vinyls, polymers and building products. The company operates in two operating segments: Olefins, which manufactures and markets polyethylene, styrene monomer and various ethylene co-products; and Vinyls, which manufactures and markets polyvinyl chloride (PVC), vinyl chloride monomer, ethylene dichloride, chlor-alkali (chlorine and caustic soda), chlorinated derivative products and ethylene, as well as manufactures and sells building products fabricated from PVC, including residential siding, trim and mouldings, pipe and fittings for various water, sewer and industrial applications, and profiles for windows and doors.
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