DescriptionSELECT-UNYTE is a soft-set, all purpose, non-seizing, PTFE* thread sealing compound that produces a leak proof seal on all types of metal and plastic threaded connections. SELECT-UNYTE is a smooth, grit free, completely homogenized, white PTFE* paste. Temperature Range Use: -50°F (-45°C) to 400°F (+204°C).