Permatex PTFE Thread Sealant - 80631 is a sealant designed for sealing and locking metal pipe fittings. It is a non-hardening, low-odor sealant that resists a wide range of chemicals, including oils, gasoline, and most acids. It is ideal for use on all metals, including stainless steel, brass, aluminum, iron, and galvanized pipe. It is designed for use on threaded connections up to 3 in diameter and can be used in temperatures ranging from -65°F to 400°F (-54°C to 204°C).