This specification covers polychlorotrifluoroethylene (PCTFE) in the form of sheet over 0.250 in. (6.25 mm) in thickness, rod, heavy wall tubing, and large molded and machined parts. Primarily for parts requiring chemical inertness and toughness up to 200C degrees (390F degrees) or high-frequency electrical insulating properties up to 165C degrees (330F degrees). The material also may be used at cryogenic temperatures.