If anaerobic sealants are only for use on metal why is Permabond LH056 a CPVC Compatible Anaerobic Sealant? The short answer is that Permabond LH056 is a designed for use as a metal pipe sealant only – if Permabond LH056 is used on metal pipe work in a fire protection system that also contains CPVC, …Continue readingAnaerobics are for metal only – so why list plastic compatibility?