1949 21 220/1 Two new types of seals will shortly be available, one of which is made from an entirely new material, polytetrafluorethylene (P.T.F.E.).
1973 VI. viii. 545 Trade names of PTFE plastics include: Teflon (USA); Fluon (UK); and Hostaflon TF (Germany).
1991 Jan. 23/3 If the leak is from the joint between the valve and the radiator, it can be sealed using PTFE tape.