FFKM O-rings EN7LT

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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 N7LT 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 N7LT  certified made from FFKM, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

19069 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 3.91x1.27 Kalrez-FFKM - 75 Shore A - Black - SES-617549 O-ring Black3.91 x 1.27FFKM - FFPM75 Shore ANee59 icon
O-Ring 46.5x5.4 Kalrez-FFKM - 75 Shore A - Black - SES-621658 O-ring Black46.5 x 5.4FFKM - FFPM75 Shore ANee57 icon
O-Ring 17.93x1.78 Kalrez-FFKM - 75 Shore A - Black - SES-619331 O-ring Black17.93 x 1.78FFKM - FFPM75 Shore ANee54 icon
O-Ring 7.9x1.25 Kalrez-FFKM - 75 Shore A - Black - SES-618065 O-ring Black7.9 x 1.25FFKM - FFPM75 Shore ANee55 icon
O-Ring 56x1.8 Kalrez-FFKM - 75 Shore A - Black - SES-622172 O-ring Black56 x 1.8FFKM - FFPM75 Shore ANee55 icon
O-Ring 215.99x3.53 Kalrez-FFKM - 75 Shore A - Black - SES-626205 O-ring Black215.99 x 3.53FFKM - FFPM75 Shore ANee56 icon
O-Ring 29.1x3 Kalrez-FFKM - 75 Shore A - Black - SES-620455 O-ring Black29.1 x 3FFKM - FFPM75 Shore ANee53 icon
O-Ring 127.8x8.6 Kalrez-FFKM - 75 Shore A - Black - SES-624563 O-ring Black127.8 x 8.6FFKM - FFPM75 Shore ANee53 icon
O-Ring 37.47x5.33 Kalrez-FFKM - 75 Shore A - Black - SES-621099 O-ring Black37.47 x 5.33FFKM - FFPM75 Shore ANee54 icon
O-Ring 155x5.5 Kalrez-FFKM - 75 Shore A - Black - SES-625209 O-ring Black155 x 5.5FFKM - FFPM75 Shore ANee53 icon
O-Ring 218x3.5 Kalrez-FFKM - 75 Shore A - Black - SES-626229 O-ring Black218 x 3.5FFKM - FFPM75 Shore ANee57 icon
O-Ring 6.7x2.5 Kalrez-FFKM - 75 Shore A - Black - SES-772476 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7559 icon
O-Ring 18.3x2.6 Kalrez-FFKM - 75 Shore A - Black - SES-619390 O-ring Black18.3 x 2.6FFKM - FFPM75 Shore ANee55 icon
O-Ring 90x2.65 Kalrez-FFKM - 75 Shore A - Black - SES-623501 O-ring Black90 x 2.65FFKM - FFPM75 Shore ANee56 icon
O-Ring 323.7x8.6 Kalrez-FFKM - 75 Shore A - Black - SES-627536 O-ring Black323.7 x 8.6FFKM - FFPM75 Shore ANee52 icon
O-Ring 33.81x0.79 Kalrez-FFKM - 75 Shore A - Black - SES-773836 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7551 icon
O-Ring 408x6 Kalrez-FFKM - 75 Shore A - Black - SES-777935 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7550 icon
O-Ring 3.5x1.7 Kalrez-FFKM - 75 Shore A - Black - SES-617493 O-ring Black3.5 x 1.7FFKM - FFPM75 Shore ANee55 icon
O-Ring 44.5x2.5 Kalrez-FFKM - 75 Shore A - Black - SES-621546 O-ring Black44.5 x 2.5FFKM - FFPM75 Shore ANee54 icon
O-Ring 180x3.55 Kalrez-FFKM - 75 Shore A - Black - SES-625647 O-ring Black180 x 3.55FFKM - FFPM75 Shore ANee56 icon
O-Ring 13.2x2.4 Kalrez-FFKM - 75 Shore A - Black - SES-618792 O-ring Black13.2 x 2.4FFKM - FFPM75 Shore ANee51 icon
O-Ring 73x6 Kalrez-FFKM - 75 Shore A - Black - SES-622905 O-ring Black73 x 6FFKM - FFPM75 Shore ANee54 icon
O-Ring 271x3.5 Kalrez-FFKM - 75 Shore A - Black - SES-626943 O-ring Black271 x 3.5FFKM - FFPM75 Shore ANee56 icon
O-Ring 19x0.6 Kalrez-FFKM - 75 Shore A - Black - SES-773218 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7560 icon
O-Ring 322x12 Kalrez-FFKM - 75 Shore A - Black - SES-777344 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7558 icon
O-Ring 13x1.2 Kalrez-FFKM - 75 Shore A - Black - SES-618750 O-ring Black13 x 1.2FFKM - FFPM75 Shore ANee57 icon
O-Ring 72x3.5 Kalrez-FFKM - 75 Shore A - Black - SES-622864 O-ring Black72 x 3.5FFKM - FFPM75 Shore ANee50 icon
O-Ring 267.8x8.6 Kalrez-FFKM - 75 Shore A - Black - SES-626903 O-ring Black267.8 x 8.6FFKM - FFPM75 Shore ANee59 icon
O-Ring 18x0.6 Kalrez-FFKM - 75 Shore A - Black - SES-773176 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7550 icon
O-Ring 316.9x12.5 Kalrez-FFKM - 75 Shore A - Black - SES-777306 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7556 icon
O-Ring 10.8x2 Kalrez-FFKM - 75 Shore A - Black - SES-618477 O-ring Black10.8 x 2FFKM - FFPM75 Shore ANee53 icon
O-Ring 63.5x2.5 Kalrez-FFKM - 75 Shore A - Black - SES-622526 O-ring Black63.5 x 2.5FFKM - FFPM75 Shore ANee60 icon
O-Ring 247x7 Kalrez-FFKM - 75 Shore A - Black - SES-626630 O-ring Black247 x 7FFKM - FFPM75 Shore ANee54 icon
O-Ring 11.7x2 Kalrez-FFKM - 75 Shore A - Black - SES-772828 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7555 icon
O-Ring 4.6x2.4 Kalrez-FFKM - 75 Shore A - Black - SES-617637 O-ring Black4.6 x 2.4FFKM - FFPM75 Shore ANee55 icon
O-Ring 47x5.33 Kalrez-FFKM - 75 Shore A - Black - SES-621687 O-ring Black47 x 5.33FFKM - FFPM75 Shore ANee56 icon
O-Ring 189.5x3 Kalrez-FFKM - 75 Shore A - Black - SES-625793 O-ring Black189.5 x 3FFKM - FFPM75 Shore ANee56 icon
O-Ring 479x10 Kalrez-FFKM - 75 Shore A - Black - SES-628790 O-ring Black479 x 10FFKM - FFPM75 Shore ANee59 icon
O-Ring 90x11 Kalrez-FFKM - 75 Shore A - Black - SES-775142 O-ring BlackPerlfluoro GummiFFKM - FFPMexcellent low temperature <br>chemical resistance Shore A7558 icon
O-Ring 9.7x1.4 Kalrez-FFKM - 75 Shore A - Black - SES-618342 O-ring Black9.7 x 1.4FFKM - FFPM75 Shore ANee53 icon