Perfluorinated rubber – FFKM EVOLAST®
FFKM materials are elastomers with the highest chemical and heat resistance. Some FFKM types can be exposed to temperatures a little above 300°C. The resistance to chemicals is nearly universal and compares to that of PTFE. The advantage of FFKM is the combination of the chemical and thermal stability of PTFE with the elastic properties of an elastomer material.
These special-purpose elastomers are used wherever safety requirements and high maintenance input justify the high price of these materials and where standard elastomers cannot be used.