... is machined from solid metal sheet in a round shapes and designed for high pressure, high temperature or highly corrosive ... spiral wound gasket.QS have enough homemade special groover and angling machines for making inner and outer rings of SWG with good ... :Carbon Steel, with or without zinc coatingSS304, SS304L, SS316, SS316LOther special materials:SS321, SS317L, Duplex 31803,Ti, Ni, Inc, Hast. ...