Multi-purpose heavy duty, white, PTFE paste thread sealant for use on aluminum, black iron, brass, copper, glass, monel, natural rubber, plastic (P.E., reinforced), PVC, ABS, CPVC, stainless steel, synthetic rubber (butyl, neoprene). Contains a unique system of fine grain PTFE particles specifically designed to fill cracks and tiny thread imperfections. Leak free joints can be tested and put into service at once. Real Tuff™ holds tight against expansion, contraction and vibration, is non-separating, will not run or drip from joints, contains no lead. Non-hardening lubricating formula permits low torque make-up and easy disassembly without galling or stripping threads. Real Tuff™ withstands temperatures from -200 to 550 deg F and provides leakproof hydraulic resistance to 12000 psi. Withstands gas pressure up to 2600 psi. Real Tuff™ is non-flammable and contains no heavy metals or volatile solvents and is applied easily with a natural bristle brush, even at temperatures as low as -25 deg F.