9584E Heat Exchanger Gasket There are six types of spiral wound gasket filled with expanded graphite used in thermal exchanger.In usual,inner－ring is 1Cr18Ni9Ti wire,filler is pure expanded graphite,metal tape is 1Cr18Ni9,outer－ring and narrow tape is carbon steel(A3) Service Range Max. Pressure(Mpa) 25 Max. Temperature(0C) 550