Trademarks: 

Viton®, Dai-el®, Fluorel®,Tecnoflon®

FKM called fluorinated elastomer

Use: 

Is suitable for hydraulics, rotary joints and hydrocarbons with gas approvals.

Trademarks: 

Aflas®, Viton Extrem®

FEPM called fluorinated elastomer

Chemical resistances: 

+ : Have a very good resistance to bad weather, heat, oils and pretroleum products. They also have excellent chemical resistance, especially to bases and amines. FEPM is distinguished form FKM/FPM by better resistance to bases and steam. 

- : Less good behavior in the cold.