Permatexs High Temperature Thread Sealant locks and seals threaded fittings. Resists leakage, vibration loosening, moisture, hydraulic fluids and diesel fuels. This high-temperature thread sealant lubricates threads for easy assembly and disassembly. Wont shred or wear like Teflon tape. Parts may be repositioned up to 4 hours after application. Temperature range -65F to 400F (-54C to 204C). Contains PTFE.