Millrose 76003 Monster Heavy-Duty Industrial Grade with PTFE, 8 Fl. Oz, Blue Blue Monster PTFE pipe thread sealant is formulated with PTFE resin, a polymer consisting of recurring tetrafluoroethylene monomers whose formula is (CF2-CF2) It is inert and compatible with a very wide range of materials Use Blue Monster on threads made from all metals, PVC, CPVC, ABS and nylon plastic pipe systems