FFKM O-rings EN694

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To provide even greater thermal stability and solvent resistance, tetrafluoroethylene (TFE) containing fluoroelastomer terpolymers were introduced in 1959. The latest FKM polymers have a much broader fluids resistance profile than standard fluoroelastomers, and are able to withstand strong bases and ketones as well as aromatic hydrocarbons, oils, acids, and steam. In 1975 a new fluoroelastomer family was introduced by Asahi Glass Co., FEPM, based on an alternating copolymer of TFE and propylene. It is marketed under the trade name AFLAS®.

The chemical resistance and high-temperature stability is due to the bulkiness of the fluorine atoms, shielding the polymer backbone and carbon-fluor bond from attack, and the high bonding energy of the carbon-fluor bond.

FFKM gives the indication for the types of improved properties for different applications.


Material: Fluorocarbon elastomers
Fluorocarbon rubber is an elastomer

Fluorocarbon elastomers are highly fluorinated carbon-based polymers that are used in applications that must withstand aggressive chemical and ozone attacks.

In general, with increasing fluorine content, the resistance to chemical attack is improved, while the low temperature properties decrease. However, there are special quality fluorocarbons that do have a high fluorine content at low temperature properties.

Good qualities:

  • Chemical compatibility
  • Good temperature resistance
  • Low compression setting
  • Resistant to minerals, oils and fats
  • Good gas tightness
  • Excellent resistance to non-polar media
  • Excellent weather and aging stability
  • Very good oxygen and ozone stability
  • Operating temperature range from -26 °C to +205/230 °C (-15 °F to +400/440 °F)
  • When used briefly, the material can tolerate even higher temperatures
  • Special compounds with improved chemical resistance are available
  • Brake fluids based on glycol
  • Low molecular weight organic acids

FFKM
FFKM are perfluoroelastomeric compounds that contain an even greater amount of fluorine than FKMO fluoroelastomers.

FFKM have an improved resistance to high temperatures and chemicals and are even resistant to environments where oxygen plasma is present for many hours. Certain grades have a maximum continuous service temperature of 327 °C / 621 °F. They are often used to make o-rings and gaskets that are used to make o-rings and gaskets that are used in applications where contact with hydrocarbons or highly corrosive liquids the case, or when a wide temperature range is encountered.

On this page we offer our range of N694 certified  O-Rings. Search for your specific O ring by using the filters on the left of the page or take your time and browse our wide range of our products. When you can not find the product you are looking for in our N694 certified made from FFKM, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 39,19x3,18 Kalrez-FFKM - 60 Shore A - Black - SES-633738 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 37,3x3,6 Kalrez-FFKM - 60 Shore A - Black - SES-633603 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 39,45x1,78 Kalrez-FFKM - 60 Shore A - Black - SES-633754 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 37,49x1,8 Kalrez-FFKM - 60 Shore A - Black - SES-633620 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 39,69x3,53 Kalrez-FFKM - 60 Shore A - Black - SES-633770 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 28,24x5,46 Kalrez-FFKM - 60 Shore A - Black - SES-632906 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 125x12 Kalrez-FFKM - 60 Shore A - Black - SES-637031 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 77x8 Kalrez-FFKM - 60 Shore A - Black - SES-635570 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 291x2 Kalrez-FFKM - 60 Shore A - Black - SES-639692 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 13,6x1,9 Kalrez-FFKM - 60 Shore A - Black - SES-631363 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 449,5x8,4 Kalrez-FFKM - 60 Shore A - Black - SES-641133 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 333x3,5 Kalrez-FFKM - 60 Shore A - Black - SES-640145 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 28,5x1,5 Kalrez-FFKM - 60 Shore A - Black - SES-632922 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 126x6 Kalrez-FFKM - 60 Shore A - Black - SES-637047 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 77,5x5,6 Kalrez-FFKM - 60 Shore A - Black - SES-635586 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 291,5x7 Kalrez-FFKM - 60 Shore A - Black - SES-639708 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 13,79x2,01 Kalrez-FFKM - 60 Shore A - Black - SES-631379 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 451x7 Kalrez-FFKM - 60 Shore A - Black - SES-641149 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 335x5 Kalrez-FFKM - 60 Shore A - Black - SES-640161 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 43x2,8 Kalrez-FFKM - 60 Shore A - Black - SES-745943 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 456x10 Kalrez-FFKM - 60 Shore A - Black - SES-750039 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 381x3,5 Kalrez-FFKM - 60 Shore A - Black - SES-640601 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 160x5,25 Kalrez-FFKM - 60 Shore A - Black - SES-747883 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 22x2,4 Kalrez-FFKM - 60 Shore A - Black - SES-632295 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 104,3x5,7 Kalrez-FFKM - 60 Shore A - Black - SES-636425 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 27,8x3,2 Kalrez-FFKM - 60 Shore A - Black - SES-632859 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 124x5,33 Kalrez-FFKM - 60 Shore A - Black - SES-636989 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 8,51x1,07 Kalrez-FFKM - 60 Shore A - Black - SES-630674 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 43,6x3,2 Kalrez-FFKM - 60 Shore A - Black - SES-745959 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 458x3,5 Kalrez-FFKM - 60 Shore A - Black - SES-750055 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 383,1x8,4 Kalrez-FFKM - 60 Shore A - Black - SES-640617 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 161x6 Kalrez-FFKM - 60 Shore A - Black - SES-747899 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 22,1x1,1 Kalrez-FFKM - 60 Shore A - Black - SES-632311 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 104,5x6 Kalrez-FFKM - 60 Shore A - Black - SES-636441 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 15,6x3 Kalrez-FFKM - 60 Shore A - Black - SES-631612 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 446x3,5 Kalrez-FFKM - 60 Shore A - Black - SES-641109 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 216x8 Kalrez-FFKM - 60 Shore A - Black - SES-748395 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 86x1,25 Kalrez-FFKM - 60 Shore A - Black - SES-635883 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 320x3,5 Kalrez-FFKM - 60 Shore A - Black - SES-640018 O-ring schwarz-FFKM60 Shore A0 icon
O-Ring 260x6,5 Kalrez-FFKM - 60 Shore A - Black - SES-748697 O-ring schwarz-FFKM60 Shore A0 icon