Oatey 31231 Pipe Joint Compound with PTFE with Brush, 8 fl.Ounce Lubricates and seals all threaded joints. White, non-hardening, non-separating, non-toxic paste. Withstands up to 3,000 PSI on gases from -50 to +400F, and 10,000 PSI on liquids from -50 to +500F. For use with water, steam, caustics or dilute acid lines of PVC, CPVC, ABS, cycolac, polypropylene, iron, steel or copper. Non-hardening gray paste seals and lubricates threaded joints For use on water, steam or air lines Non-separating and non-toxic material Not for use on Plastic threads