Anchor Brand White PTFE Thread Sealant Tapes Tapes can be used in a wide variety of applications, from general purpose service such as water and air, to difficult service such as acids and pure oxygen. Easy installation, several wraps around the male threads and you're done. Made of 100% PTFE; compatible with almost any process fluid (except molten alkalis and elemental fluorine). Unlimited shelf life, no age deterioration, non-hardening. Pack of 1