Made with Teflon, pure white thread lubricant and sealant. Brushable paste dries slowly, non-hardening, withstands up to 3000 PSI on gases at temps from -50d F to +500d F. Use on water, steam, natural and LP gas, oils, fuels, dilute acids. Apply to metals, PVC, CPVC, ABS, polypropylene and nylon. All-purpose sealant for HEAVY DUTY applications. Warning: Never use any pipe thread sealant paste or stick on halogens or oxygen; use PTFE Pipe Thread Tape.