- 2 - HDPE / PVC / TEFLON SHEETS HDPE sheets High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a polyethylene thermoplastic made from petroleum. Known for its large strength to density ratio, HDPE is mm used in the production of plastic bottles, rrosion-resistant piping, geo membranes, and plastic lumber. PVC sheets