FFKM O-rings EN894

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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 N894 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 N894 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 7,5x1,2 Kalrez-FFKM - 75 Shore A - Black - SES-529458 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 7,01x1,65 Kalrez-FFKM - 75 Shore A - Black - SES-529421 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 61x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-533217 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 317,8x8,6 Kalrez-FFKM - 75 Shore A - Black - SES-537397 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 40x11 Kalrez-FFKM - 75 Shore A - Black - SES-681926 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 17x2 Kalrez-FFKM - 75 Shore A - Black - SES-527123 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 26,1x1,5 Kalrez-FFKM - 75 Shore A - Black - SES-531381 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 142,24x5,33 Kalrez-FFKM - 75 Shore A - Black - SES-474928 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 26x3,5 Kalrez-FFKM - 75 Shore A - Black - SES-531373 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 155x3,1 Kalrez-FFKM - 75 Shore A - Black - SES-535499 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 3,56x1,78 Kalrez-FFKM - 75 Shore A - Black - SES-680101 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 177,8x6,6 Kalrez-FFKM - 75 Shore A - Black - SES-684159 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 53,57x3,53 Kalrez-FFKM - 75 Shore A - Black - SES-474804 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 22,3x2,7 Kalrez-FFKM - 75 Shore A - Black - SES-531044 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 141x3 Kalrez-FFKM - 75 Shore A - Black - SES-535242 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 772x4 Kalrez-FFKM - 75 Shore A - Black - SES-539301 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 152,4x4,87 Kalrez-FFKM - 75 Shore A - Black - SES-683897 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 13,6x1,9 Kalrez-FFKM - 75 Shore A - Black - SES-530211 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 100x1 Kalrez-FFKM - 75 Shore A - Black - SES-534339 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 461x8,4 Kalrez-FFKM - 75 Shore A - Black - SES-538490 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 90x6,25 Kalrez-FFKM - 75 Shore A - Black - SES-683021 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 2,9x1,78 Kalrez-FFKM - 75 Shore A - Black - SES-474669 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 21x5 Kalrez-FFKM - 75 Shore A - Black - SES-530928 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 199,5x8,4 Kalrez-FFKM - 75 Shore A - Black - SES-536112 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 11,7x5,8 Kalrez-FFKM - 75 Shore A - Black - SES-680717 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 258x6,3 Kalrez-FFKM - 75 Shore A - Black - SES-684777 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 60,4x3,1 Kalrez-FFKM - 75 Shore A - Black - SES-533205 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 316x7 Kalrez-FFKM - 75 Shore A - Black - SES-537389 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 40x5,9 Kalrez-FFKM - 75 Shore A - Black - SES-681922 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 445x15 Kalrez-FFKM - 75 Shore A - Black - SES-686064 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 40x1 Kalrez-FFKM - 75 Shore A - Black - SES-532267 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 21,5x3,6 Kalrez-FFKM - 75 Shore A - Black - SES-530975 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 134x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-535105 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 660x5,34 Kalrez-FFKM - 75 Shore A - Black - SES-539237 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 67x4,5 Kalrez-FFKM - 75 Shore A - Black - SES-682593 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 13,79x2,01 Kalrez-FFKM - 75 Shore A - Black - SES-530224 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 100,5x4,5 Kalrez-FFKM - 75 Shore A - Black - SES-534357 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 467x6 Kalrez-FFKM - 75 Shore A - Black - SES-538513 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 92x8 Kalrez-FFKM - 75 Shore A - Black - SES-683050 O-ring schwarz-FFKM75 Shore A0 icon
O-Ring 350x2,3 Kalrez-FFKM - 75 Shore A - Black - SES-685429 O-ring schwarz-FFKM75 Shore A0 icon