FKM (Fluoroelastomers) and FFKM (Perfluoroelastomer) are two elastomers used in the manufacture of seals under extreme conditions. FKM is HK material, FFKM is KK material according to ASTM D2000 classification system. FKM can be used in acid, oil and fuel environments at a temperature of 230 degrees Celsius continuously. Meanwhile, FFKM can be used in most liquid environments, the use temperature can be up to 320 degrees Celsius.
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