T.C.I PTFE Polytetrafluoroethylene Pall ring (100% pure PTFE) is a kind of special plastic random packing designed to serve special working environment and applications. PTFE has very stable chemical performance, and hardly makes reaction with any acid and alkali. PTFE Pall ring & Raschig ring can be used stably in the temperature of -200 to +250 centigrade thermometer.