polyvinyl chloride (PVC)
- A thermoplastic resin derived from the polymerization of vinyl chloride. Plasticizers have been added to give it flexibility. Widely used in piping products, it is also used for siding, floor covering, window housing, and fencing. In roofing, it is used for membranes and flashing. Also used in the manufacture of nonmetallic waterstops for concrete. PVC materials are to be avoided in green construction because it has been linked to cancer, birth defects, and groundwater contamination.