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 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 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 N794 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 N794 certified made from FFKM, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.