Technical Customer Service Here you will find some helpful tools to design your filter:  FFKM-Gasket Properties    Material code designation DIN ISO 1629 FFKM  Material code designation ASTM D 1418 FFPM  Material name / description By fluorine India rubber  Trade name (part-protected !) Kalrez, Simritz, Chemraz  Low temperatur operating area from -15°C  High temperatur operating area up to +280°C, Special design: +300°C  Main area of application Aggressive media and steam  Excellent swelling resistance against A lot of acids, lyes, steam, oxygen  Evil swelling resistance against fluorine-containing connections (Freon), strong oxidation media  Miscellaneous The very expensive gaskets from FFKM are used everywhere where extreme safety standards are valid.