Extra heavy, full density tape especially for gas lines. Recommended leakproof 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 10,000 PSI; .0035 mil thick, tolerates -450 to +500 degrees Fahrenheit. Meets Federal Specification T-27730A. U.L. Listed.