OC Three PTFE Paste Joint and Thread Sealer is an oxygen-safe, aqueous-based PTFE formulation. It is a homogeneous white paste that penetrates thread convolutions more effectively, and more safely, than PTFE tape. Tested, approved and certified by NASA (ASTM G72) and The German Federal Institute for Materials Testing (BAM) for gaseous and liquid oxygen service. OC Three is approved and used by the major industrial gas providers, and it is NSF registered. Use in extreme temperatures (-400o F to +500o F) and as a vacuum grease for mid vacuum specifications to 10-3 Torr or in pressures up to 3500 psi (10,000 psi for fuel systems, 300 psi for natural gas). OC Three is especially capable for sealing oxygen and acetylene cylinder valves. It is compatible with diesel fuel, liquid propane gas, and pure oxygen. OC Three is safe for use with food processing applications. It is easy to apply from its 4 oz. (113.4 gram) squeeze tube with extended nipple and resealing cap. OC Three is a superior PTFE thread sealant paste that contains these optimal properties: Water Soluble – Anti-Galling – Anti-Corrosive – Anti-Seize – Chemically Inert – Non-Toxic – Non-Flammable – Non-Migrating – Odorless.