Description:Sealing materials, Pipe couplings, Screwed fittings, Pipe fittings, Metals, Water, Gas pipes, 1st family gases, 2nd family gases, 3rd family gases, Hot-water supply systems, Tape, Polytetrafluoroethylene, Gas-powered devices, Environment (working), Temperature, Pressure, Classification systems, Dimensions, Dimensional tolerances, Width, Weight tolerances, Marking, Instructions for use, Wrapping tests, Dimensional measurement, Thermal testing, Thermal-cycling tests, Leak tests, Pressure testing, Vibration testing, Performance testing, Determination of content, Lubricants, Testing conditions, Test specimens, Test equipment