Seals in the chemical industry are under challenging conditions. The seals demand high resistance from corrosive chemicals and wide temperature ranges. This means that there is not a single material to meet all the requirements of every application. The material needs to be chosen to meet the needs the specific chemical conditions. EPDM is used in general chemical acid-base, NBR is used in hydrocarbon and FKM for high temperature acid. For the most extreme conditions FFKM is ought to be used.