Big Blue 8 fl. oz. Pipe Joint Compound: Flexible blue, non-hardening, non-separating, non-toxic, odorless, easy cleanup. Use on PVC, CPVC, ABS, polyethylene, polypropylene, iron, steel, copper or brass threads up to 2". Withstands up to 3,000 PSI in gases from -50 to +400 F and 10,000 PSI in liquids from -50 to +500 F. For use with water, steam, caustic, or dilute acid lines on PVC, CPVC, ABS, cyclolac, polypropylene, iron, steel, or copper Lubricates and seals thread on water, natural gas, steam, fuel lines air, causative agents and dilute acids.