This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist. 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.