Extra heavy, full density tape especially for gas lines. Recommended leak-proof sealant for lines carrying natural gas, propane, butane, water, oil and chemical installations. Use on plastic, stainless steel, aluminum and all metals, ceramic, synthetic rubber, monel and carbon pipe, conduit, valves, bolts, anything with a thread. Suitable for use on oxygen systems. Permits easy disassembly. Pressure rating of 10,000 psi 0.0035 mil thick, tolerates up to -450 to 500 deg F. Meets Federal Specification T-27730A. UL listed.