PTFE gas thread sealant tape. The ideal sealant for pipe thread connections. It is non-toxic and will not contaminate fluids or gases. Chemically inert, it resists corrosive action of acids, alkalis and solvents. UL and ULC listed for natural gas (to 1000 PSI) and propane installations. -450 to 500°F, -268 to 260°C.