... gasket with inner ring/centering ringThe spiral wound gasket is made of intercalarted V or W type formed steel belt and nometalic belt ... alloy, and so on.Spiral material:A3 ,OCr13, 1Cr13, 1Cr18,Ni9, Ti ,304, 316 ,316L,inconel,monel graphite, ptfe, asbestos,non ... -asbestosStandard: ASME,ASNI,JIS, JPI, ISO, DN spiral wound gasket with inner ring and outer ring