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.

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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 3,91x1,27 Kalrez-FFKM - 75 Shore A - Black - SES-617549 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 46,5x5,4 Kalrez-FFKM - 75 Shore A - Black - SES-621658 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 17,93x1,78 Kalrez-FFKM - 75 Shore A - Black - SES-619331 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 7,9x1,25 Kalrez-FFKM - 75 Shore A - Black - SES-618065 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 56x1,8 Kalrez-FFKM - 75 Shore A - Black - SES-622172 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 215,99x3,53 Kalrez-FFKM - 75 Shore A - Black - SES-626205 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 29,1x3 Kalrez-FFKM - 75 Shore A - Black - SES-620455 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 127,8x8,6 Kalrez-FFKM - 75 Shore A - Black - SES-624563 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 37,47x5,33 Kalrez-FFKM - 75 Shore A - Black - SES-621099 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 155x5,5 Kalrez-FFKM - 75 Shore A - Black - SES-625209 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 218x3,5 Kalrez-FFKM - 75 Shore A - Black - SES-626229 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 6,7x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-772476 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 18,3x2,6 Kalrez-FFKM - 75 Shore A - Black - SES-619390 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 90x2,65 Kalrez-FFKM - 75 Shore A - Black - SES-623501 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 323,7x8,6 Kalrez-FFKM - 75 Shore A - Black - SES-627536 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 33,81x0,79 Kalrez-FFKM - 75 Shore A - Black - SES-773836 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 408x6 Kalrez-FFKM - 75 Shore A - Black - SES-777935 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 3,5x1,7 Kalrez-FFKM - 75 Shore A - Black - SES-617493 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 44,5x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-621546 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 180x3,55 Kalrez-FFKM - 75 Shore A - Black - SES-625647 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 13,2x2,4 Kalrez-FFKM - 75 Shore A - Black - SES-618792 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 73x6 Kalrez-FFKM - 75 Shore A - Black - SES-622905 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 271x3,5 Kalrez-FFKM - 75 Shore A - Black - SES-626943 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 19x0,6 Kalrez-FFKM - 75 Shore A - Black - SES-773218 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 322x12 Kalrez-FFKM - 75 Shore A - Black - SES-777344 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 13x1,2 Kalrez-FFKM - 75 Shore A - Black - SES-618750 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 72x3,5 Kalrez-FFKM - 75 Shore A - Black - SES-622864 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 267,8x8,6 Kalrez-FFKM - 75 Shore A - Black - SES-626903 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 18x0,6 Kalrez-FFKM - 75 Shore A - Black - SES-773176 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 316,9x12,5 Kalrez-FFKM - 75 Shore A - Black - SES-777306 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 10,8x2 Kalrez-FFKM - 75 Shore A - Black - SES-618477 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 63,5x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-622526 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 247x7 Kalrez-FFKM - 75 Shore A - Black - SES-626630 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 11,7x2 Kalrez-FFKM - 75 Shore A - Black - SES-772828 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 4,6x2,4 Kalrez-FFKM - 75 Shore A - Black - SES-617637 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 47x5,33 Kalrez-FFKM - 75 Shore A - Black - SES-621687 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 189,5x3 Kalrez-FFKM - 75 Shore A - Black - SES-625793 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 479x10 Kalrez-FFKM - 75 Shore A - Black - SES-628790 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 90x11 Kalrez-FFKM - 75 Shore A - Black - SES-775142 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 9,7x1,4 Kalrez-FFKM - 75 Shore A - Black - SES-618342 O-ring schwarz-FFKM75 Shore A0 icon