Gasket Ring 1.Graphite,PTFE and asbestos as filler 2. -200-600 ... seal ability 4.Used in pumps, valves, tank Spiral Wound Gasket is the best among all the half-metal seal gaskets ... , metallurgy, ship-building, machine, atomic energy, space navigation.Hoop/Inner/Outer Ring Material: Ocr13, 304SS, 304LS, 316SS, 316LSS, Low Carbon Steel, 316Tiss ...