Extra heavy, full density tape especially for gas lines. Recommended leakproof sealant for lines carrying natural gas, propane, butane; and water, oil and chemical installations. Use on plastic, stainless steel, aluminum and all metals, ceramic, syntheticrubber, 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° F. Meets Federal Specification T-27730A. U.L. Listed.