Gasket Ring 1.Graphite,PTFE and asbestos as filler 2. -200-600 ... the half-metal seal gaskets, which is made by metal hoop band and different kinds of filling material. It is used ... powder, metallurgy, ship-building, machine, atomic energy, space navigation.Hoop/Inner/Outer Ring Material: Ocr13, 304SS, 304LS, 316SS, 316LSS, Low Carbon Steel ...