305 – Perfluorelastomers (FFKM)

ASTM D2000 Classification: KK


Temperature Range:

-26°C to +260°C (-15°F to +500°F).



The relative inertness of Fluorelastomers is provided by fluorine-carbon bonds on the elastomer backbone. The greater the fluorine content, the higher the resistance to chemical attack. Where fluorocarbon rubbers (FKM) have a fluorine content of 63% to 68 %, the Perfluorocarbons (FFKM) have a fluorine content of 73%. FFKM Perfluorelastomer have the best chemical resistance of all the elastomers, they have resistance to almost all chemicals, including inorganic acids, alkalines, ketones, esters, alcohols, fuels, and hot water and are used for applications in aggressive chemical environments with resistance to temperatures up to +326°C (+620°F).


EMI RefeferenceSpecificationHardness IRHD Tensile Strength (Mpa)Elongation at Break %Colour
FFKM601General Use60°13220Black
FFKM701General Use70°18.5150Black
FFKM703FDA Compliant70°13.8178White
FFKM751General Use75°19150Black
FFKM754OFHigh Chem Resist75°17.4249Black
FFKM754HFHigh Chem Resist75°21.6135Black
FFKM801General Use80°21.6135Black
FFKM803WFDA Compliant80°17125White
FFKM803BFDA Compliant80°15140Black
FFKM806High Temp80°16.5130Black
FFKM901General Use90°18120Black
FFKM904High Chem Resist90°20.1118Black
FFKM801Hi Chem Low Temp90°13114Black

Full data sheets for all grades are available on request.

* The information above is supplied in good faith and believed to be correct. This information is supplied upon the condition that persons receiving this will make their own determination as to its suitability for their purposes prior to use. EMI makes no representations or warranties, either expressed or implied with respect to the information or the product to which this information refers.