FFKM O-rings EN8SR

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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 N8SR 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 N8SR certified made from FFKM, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

19130 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 7.92x2.39 Kalrez-FFKM - 75 Shore A - Black - SES-838212 O-ring Black7.92 mm x 2.39 mmFFKM - FFPM75 Shore ANee54 icon
O-Ring 10.1x1 Kalrez-FFKM - 75 Shore A - Black - SES-838684 O-ring Black10.1 mm x 1 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 39.2x3 Kalrez-FFKM - 75 Shore A - Black - SES-842801 O-ring Black39.2 mm x 3 mmFFKM - FFPM75 Shore ANee55 icon
O-Ring 2x0.97 Kalrez-FFKM - 75 Shore A - Black - SES-836938 O-ring Black2 mm x 0.97 mmFFKM - FFPM75 Shore ANee54 icon
O-Ring 24.35x3.2 Kalrez-FFKM - 75 Shore A - Black - SES-841051 O-ring Black24.35 mm x 3.2 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 69.85x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-845120 O-ring Black69.85 mm x 3.53 mmFFKM - FFPM75 Shore ANee54 icon
O-Ring 168.3x1.78 Kalrez-FFKM - 75 Shore A - Black - SES-849218 O-ring Black168.3 mm x 1.78 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 2.6x1.3 Kalrez-FFKM - 75 Shore A - Black - SES-837068 O-ring Black2.6 mm x 1.3 mmFFKM - FFPM75 Shore ANee58 icon
O-Ring 25x6.2 Kalrez-FFKM - 75 Shore A - Black - SES-841180 O-ring Black25 mm x 6.2 mmFFKM - FFPM75 Shore ANee59 icon
O-Ring 72x12 Kalrez-FFKM - 75 Shore A - Black - SES-845250 O-ring Black72 mm x 12 mmFFKM - FFPM75 Shore ANee59 icon
O-Ring 173x5.3 Kalrez-FFKM - 75 Shore A - Black - SES-849349 O-ring Black173 mm x 5.3 mmFFKM - FFPM75 Shore ANee53 icon
O-Ring 379x3.5 Kalrez-FFKM - 75 Shore A - Black - SES-853380 O-ring Black379 mm x 3.5 mmFFKM - FFPM75 Shore ANee60 icon
O-Ring 1.25x1.5 Kalrez-FFKM - 75 Shore A - Black - SES-836827 O-ring Black1.25 mm x 1.5 mmFFKM - FFPM75 Shore ANee60 icon
O-Ring 23.52x1.83 Kalrez-FFKM - 75 Shore A - Black - SES-840946 O-ring Black23.52 mm x 1.83 mmFFKM - FFPM75 Shore ANee50 icon
O-Ring 125x25 Kalrez-FFKM - 75 Shore A - Black - SES-847794 O-ring Black125 mm x 25 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 291.47x5.33 Kalrez-FFKM - 75 Shore A - Black - SES-851893 O-ring Black291.47 mm x 5.33 mmFFKM - FFPM75 Shore ANee60 icon
O-Ring 928.6x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-855927 O-ring Black928.6 mm x 3.53 mmFFKM - FFPM75 Shore ANee50 icon
O-Ring 15.6x3 Kalrez-FFKM - 75 Shore A - Black - SES-839703 O-ring Black15.6 mm x 3 mmFFKM - FFPM75 Shore ANee52 icon
O-Ring 50.9x2.4 Kalrez-FFKM - 75 Shore A - Black - SES-843825 O-ring Black50.9 mm x 2.4 mmFFKM - FFPM75 Shore ANee54 icon
O-Ring 107x1.5 Kalrez-FFKM - 75 Shore A - Black - SES-846979 O-ring Black107 mm x 1.5 mmFFKM - FFPM75 Shore ANee59 icon
O-Ring 249x11 Kalrez-FFKM - 75 Shore A - Black - SES-851079 O-ring Black249 mm x 11 mmFFKM - FFPM75 Shore ANee60 icon
O-Ring 503x6 Kalrez-FFKM - 75 Shore A - Black - SES-855114 O-ring Black503 mm x 6 mmFFKM - FFPM75 Shore ANee50 icon
O-Ring 10.79x2.61 Kalrez-FFKM - 75 Shore A - Black - SES-838793 O-ring Black10.79 mm x 2.61 mmFFKM - FFPM75 Shore ANee58 icon
O-Ring 39.67x9.52 Kalrez-FFKM - 75 Shore A - Black - SES-842849 O-ring Black39.67 mm x 9.52 mmFFKM - FFPM75 Shore ANee51 icon
O-Ring 106x8 Kalrez-FFKM - 75 Shore A - Black - SES-846964 O-ring Black106 mm x 8 mmFFKM - FFPM75 Shore ANee51 icon
O-Ring 245x6.7 Kalrez-FFKM - 75 Shore A - Black - SES-850999 O-ring Black245 mm x 6.7 mmFFKM - FFPM75 Shore ANee55 icon
O-Ring 501x5 Kalrez-FFKM - 75 Shore A - Black - SES-855099 O-ring Black501 mm x 5 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 9x1.4 Kalrez-FFKM - 75 Shore A - Black - SES-838419 O-ring Black9 mm x 1.4 mmFFKM - FFPM75 Shore ANee54 icon
O-Ring 36.83x1.19 Kalrez-FFKM - 75 Shore A - Black - SES-842542 O-ring Black36.83 mm x 1.19 mmFFKM - FFPM75 Shore ANee53 icon
O-Ring 98.42x4.77 Kalrez-FFKM - 75 Shore A - Black - SES-846604 O-ring Black98.42 mm x 4.77 mmFFKM - FFPM75 Shore ANee56 icon
O-Ring 231x4 Kalrez-FFKM - 75 Shore A - Black - SES-850706 O-ring Black231 mm x 4 mmFFKM - FFPM75 Shore ANee60 icon
O-Ring 473x10 Kalrez-FFKM - 75 Shore A - Black - SES-854743 O-ring Black473 mm x 10 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 22.5x3.5 Kalrez-FFKM - 75 Shore A - Black - SES-840803 O-ring Black22.5 mm x 3.5 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 65.1x4.6 Kalrez-FFKM - 75 Shore A - Black - SES-844878 O-ring Black65.1 mm x 4.6 mmFFKM - FFPM75 Shore ANee56 icon
O-Ring 160x2.5 Kalrez-FFKM - 75 Shore A - Black - SES-848982 O-ring Black160 mm x 2.5 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 355x8 Kalrez-FFKM - 75 Shore A - Black - SES-853019 O-ring Black355 mm x 8 mmFFKM - FFPM75 Shore ANee59 icon
O-Ring 5x3.25 Kalrez-FFKM - 75 Shore A - Black - SES-837585 O-ring Black5 mm x 3.25 mmFFKM - FFPM75 Shore ANee53 icon
O-Ring 29.2x3 Kalrez-FFKM - 75 Shore A - Black - SES-841703 O-ring Black29.2 mm x 3 mmFFKM - FFPM75 Shore ANee51 icon
O-Ring 81.75x1.8 Kalrez-FFKM - 75 Shore A - Black - SES-845778 O-ring Black81.75 mm x 1.8 mmFFKM - FFPM75 Shore ANee57 icon
O-Ring 194x6.1 Kalrez-FFKM - 75 Shore A - Black - SES-849882 O-ring Black194 mm x 6.1 mmFFKM - FFPM75 Shore ANee52 icon