![]() Finally, a sealing compound must not lubricate the joint to the point that over-tightening is encouraged. A proper sealant must be approved by the manufacturer to be harmless to the joint materials and not contaminate the fluid in the piping system. Many brands of pipe sealants contain oils, solvents or carriers that can damage PVC. ![]() The sealing compound must be compatible to all materials and media to which the joint will be exposed. ![]() Conversely, a non-hardening compound is forced by the internal fluid pressure into potential points of leakage performing a true sealing role. Teflon tapes and hardening pastes can permit a leak path to develop when a joint is backed off, mechanically flexed or expanded with changing temperatures. Recommended good practice is to use a thread sealant (not a thread lubricant) to assemble the joint to finger tight plus one and one-half (1½) turns, two turns at the most. When assembling threaded PVC fittings, a sealing compound that is non-hardening is the best.
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