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.

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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 9x2,4 Kalrez-FFKM - 75 Shore A - Black - SES-605708 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 11,7x1,8 Kalrez-FFKM - 75 Shore A - Black - SES-606077 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 60x1,8 Kalrez-FFKM - 75 Shore A - Black - SES-609844 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 31x1,5 Kalrez-FFKM - 75 Shore A - Black - SES-608072 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 28,3x2 Kalrez-FFKM - 75 Shore A - Black - SES-607873 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 6x1,7 Kalrez-FFKM - 75 Shore A - Black - SES-605290 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 50x1,5 Kalrez-FFKM - 75 Shore A - Black - SES-609341 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 200,66x1,78 Kalrez-FFKM - 75 Shore A - Black - SES-613462 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 43,3x4,15 Kalrez-FFKM - 75 Shore A - Black - SES-752311 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 26,07x2,62 Kalrez-FFKM - 75 Shore A - Black - SES-607681 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 116,7x2,21 Kalrez-FFKM - 75 Shore A - Black - SES-611748 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 417x3,53 Kalrez-FFKM - 75 Shore A - Black - SES-615848 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 64,05x3,1 Kalrez-FFKM - 75 Shore A - Black - SES-610035 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 249,5x5,7 Kalrez-FFKM - 75 Shore A - Black - SES-614142 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 76,12x1,52 Kalrez-FFKM - 75 Shore A - Black - SES-753018 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 5,6x1,6 Kalrez-FFKM - 75 Shore A - Black - SES-757140 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 6,07x1,27 Kalrez-FFKM - 75 Shore A - Black - SES-605313 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 26,8x3 Kalrez-FFKM - 75 Shore A - Black - SES-607735 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 118,5x5 Kalrez-FFKM - 75 Shore A - Black - SES-611804 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 423x6 Kalrez-FFKM - 75 Shore A - Black - SES-615906 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 222x2,5 Kalrez-FFKM - 75 Shore A - Black - SES-754787 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 28x5,3 Kalrez-FFKM - 75 Shore A - Black - SES-607853 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 125x7 Kalrez-FFKM - 75 Shore A - Black - SES-611989 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 440x4 Kalrez-FFKM - 75 Shore A - Black - SES-616028 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 248x12 Kalrez-FFKM - 75 Shore A - Black - SES-754976 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 8,1x4 Kalrez-FFKM - 75 Shore A - Black - SES-605593 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 56x3 Kalrez-FFKM - 75 Shore A - Black - SES-609658 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 221,8x3,53 Kalrez-FFKM - 75 Shore A - Black - SES-613770 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 57,5x4,3 Kalrez-FFKM - 75 Shore A - Black - SES-752632 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 1,2x1,25 Kalrez-FFKM - 75 Shore A - Black - SES-756762 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 56,5x2,3 Kalrez-FFKM - 75 Shore A - Black - SES-752604 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 0,8x2 Kalrez-FFKM - 75 Shore A - Black - SES-756740 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 20,2x3,55 Kalrez-FFKM - 75 Shore A - Black - SES-607085 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 96x3,53 Kalrez-FFKM - 75 Shore A - Black - SES-611157 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 342,8x8,6 Kalrez-FFKM - 75 Shore A - Black - SES-615199 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 151x11 Kalrez-FFKM - 75 Shore A - Black - SES-754150 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 161,29x6,99 Kalrez-FFKM - 75 Shore A - Black - SES-612816 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 15,36x1,98 Kalrez-FFKM - 75 Shore A - Black - SES-606530 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 177x9,5 Kalrez-FFKM - 75 Shore A - Black - SES-754418 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon
O-Ring 32x0,7 Kalrez-FFKM - 75 Shore A - Black - SES-758538 O-ring schwarzFDA - USP Class VIFFKM75 Shore A0 icon