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By certification 
Product name: FEPM o ring
Size: Standard and non standard
Color: Common is black, can be any color as you need
The full name of material of FEPM O ring is Tetrafluoroethylene propylene, which is also know as Aflas® which is a registered trade mark of Asahi Glass Co. (AGC).
Compared to common FKM O ring, FEPM O ring has excellent resistance to a broader range of chemicals, such as alkali/bases, stems. However, FEPM O ring is not compatible with aromatic and chlorinated hydrocarbons, and some fairly common organic solvents.
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