FFKM O-rings EN7FD

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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 N7FD 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 N7FD certified made from FFKM, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

19121 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 9x2.4 Kalrez-FFKM - 75 Shore A - Black - SES-605708 O-ring Black9 x 2.4FFKM - FFPM75 Shore AJa54 icon
O-Ring 11.7x1.8 Kalrez-FFKM - 75 Shore A - Black - SES-606077 O-ring Black11.7 x 1.8FFKM - FFPM75 Shore AJa58 icon
O-Ring 60x1.8 Kalrez-FFKM - 75 Shore A - Black - SES-609844 O-ring Black60 x 1.8FFKM - FFPM75 Shore AJa57 icon
O-Ring 31x1.5 Kalrez-FFKM - 75 Shore A - Black - SES-608072 O-ring Black31 x 1.5FFKM - FFPM75 Shore AJa53 icon
O-Ring 28.3x2 Kalrez-FFKM - 75 Shore A - Black - SES-607873 O-ring Black28.3 x 2FFKM - FFPM75 Shore AJa51 icon
O-Ring 6x1.7 Kalrez-FFKM - 75 Shore A - Black - SES-605290 O-ring Black6 x 1.7FFKM - FFPM75 Shore AJa58 icon
O-Ring 50x1.5 Kalrez-FFKM - 75 Shore A - Black - SES-609341 O-ring Black50 x 1.5FFKM - FFPM75 Shore AJa50 icon
O-Ring 200.66x1.78 Kalrez-FFKM - 75 Shore A - Black - SES-613462 O-ring Black200.66 x 1.78FFKM - FFPM75 Shore AJa57 icon
O-Ring 43.3x4.15 Kalrez-FFKM - 75 Shore A - Black - SES-752311 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7559 icon
O-Ring 26.07x2.62 Kalrez-FFKM - 75 Shore A - Black - SES-607681 O-ring Black26.07 x 2.62FFKM - FFPM75 Shore AJa57 icon
O-Ring 116.7x2.21 Kalrez-FFKM - 75 Shore A - Black - SES-611748 O-ring Black116.7 x 2.21FFKM - FFPM75 Shore AJa55 icon
O-Ring 417x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-615848 O-ring Black417 x 3.53FFKM - FFPM75 Shore AJa57 icon
O-Ring 64.05x3.1 Kalrez-FFKM - 75 Shore A - Black - SES-610035 O-ring Black64.05 x 3.1FFKM - FFPM75 Shore AJa60 icon
O-Ring 249.5x5.7 Kalrez-FFKM - 75 Shore A - Black - SES-614142 O-ring Black249.5 x 5.7FFKM - FFPM75 Shore AJa52 icon
O-Ring 76.12x1.52 Kalrez-FFKM - 75 Shore A - Black - SES-753018 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7560 icon
O-Ring 5.6x1.6 Kalrez-FFKM - 75 Shore A - Black - SES-757140 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7556 icon
O-Ring 6.07x1.27 Kalrez-FFKM - 75 Shore A - Black - SES-605313 O-ring Black6.07 x 1.27FFKM - FFPM75 Shore AJa52 icon
O-Ring 26.8x3 Kalrez-FFKM - 75 Shore A - Black - SES-607735 O-ring Black26.8 x 3FFKM - FFPM75 Shore AJa52 icon
O-Ring 118.5x5 Kalrez-FFKM - 75 Shore A - Black - SES-611804 O-ring Black118.5 x 5FFKM - FFPM75 Shore AJa58 icon
O-Ring 423x6 Kalrez-FFKM - 75 Shore A - Black - SES-615906 O-ring Black423 x 6FFKM - FFPM75 Shore AJa53 icon
O-Ring 222x2.5 Kalrez-FFKM - 75 Shore A - Black - SES-754787 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7552 icon
O-Ring 28x5.3 Kalrez-FFKM - 75 Shore A - Black - SES-607853 O-ring Black28 x 5.3FFKM - FFPM75 Shore AJa56 icon
O-Ring 125x7 Kalrez-FFKM - 75 Shore A - Black - SES-611989 O-ring Black125 x 7FFKM - FFPM75 Shore AJa51 icon
O-Ring 440x4 Kalrez-FFKM - 75 Shore A - Black - SES-616028 O-ring Black440 x 4FFKM - FFPM75 Shore AJa50 icon
O-Ring 248x12 Kalrez-FFKM - 75 Shore A - Black - SES-754976 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7555 icon
O-Ring 8.1x4 Kalrez-FFKM - 75 Shore A - Black - SES-605593 O-ring Black8.1 x 4FFKM - FFPM75 Shore AJa51 icon
O-Ring 56x3 Kalrez-FFKM - 75 Shore A - Black - SES-609658 O-ring Black56 x 3FFKM - FFPM75 Shore AJa60 icon
O-Ring 221.8x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-613770 O-ring Black221.8 x 3.53FFKM - FFPM75 Shore AJa55 icon
O-Ring 57.5x4.3 Kalrez-FFKM - 75 Shore A - Black - SES-752632 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7560 icon
O-Ring 1.2x1.25 Kalrez-FFKM - 75 Shore A - Black - SES-756762 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7551 icon
O-Ring 56.5x2.3 Kalrez-FFKM - 75 Shore A - Black - SES-752604 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7559 icon
O-Ring 0.8x2 Kalrez-FFKM - 75 Shore A - Black - SES-756740 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7558 icon
O-Ring 20.2x3.55 Kalrez-FFKM - 75 Shore A - Black - SES-607085 O-ring Black20.2 x 3.55FFKM - FFPM75 Shore AJa51 icon
O-Ring 96x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-611157 O-ring Black96 x 3.53FFKM - FFPM75 Shore AJa53 icon
O-Ring 342.8x8.6 Kalrez-FFKM - 75 Shore A - Black - SES-615199 O-ring Black342.8 x 8.6FFKM - FFPM75 Shore AJa51 icon
O-Ring 151x11 Kalrez-FFKM - 75 Shore A - Black - SES-754150 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7556 icon
O-Ring 161.29x6.99 Kalrez-FFKM - 75 Shore A - Black - SES-612816 O-ring Black161.29 x 6.99FFKM - FFPM75 Shore AJa60 icon
O-Ring 15.36x1.98 Kalrez-FFKM - 75 Shore A - Black - SES-606530 O-ring Black15.36 x 1.98FFKM - FFPM75 Shore AJa51 icon
O-Ring 177x9.5 Kalrez-FFKM - 75 Shore A - Black - SES-754418 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7560 icon
O-Ring 32x0.7 Kalrez-FFKM - 75 Shore A - Black - SES-758538 O-ring BlackPerlfluoro GummiFFKM - FFPMFDA 21 CFR 177.2400<br> USP Class VI<br> 3A-Sanitary Standard<br> chemical resistance Shore A7554 icon