Elastomer Materials



FKM – Fluoro Rubber

FKM - Structural Formula

FKM is a copolymer made of highly fluorinated hydrocarbons and developed during the 1950s. FKM displays very good resistance to media, ozone and aging. The material is also stable in fuels as well as petroleum-based oils and greases, along with aliphatic and aromatic hydrocarbons.


It is unstable with regard to polar solvents (e.g. acetone, MEK and ethyl acetate), low molecular weight organic acids (formic and acetic acid), glycol-based brake fluid, ammonia gas, amines, alkalis and superheated steam. There are copolymers, terpolymers and tetrapolymers with fluorine content varying between 65 and 71 percent. In this way, FKM can be precisely designed for specific requirements in terms of media resistance and cold flexibility. This is a benefit that, in particular, reliably protects applications in the chemical and pharmaceutical industries that have aggressive media and process temperatures of above 140 °C, which materials such as EPDM or HNBR cannot handle.

The material FKM 38269 is the preferred choice for standard articles such as O-rings. The red material FKM 37508 is available for formed parts that are used in systems with less aggressive cleaning processes.

Material Properties of FKM in Technical Applications

Fluoro rubber can be used from −25 °C to 200 °C and is predominantly used for seals in the automotive and commercial vehicle industry and in petroleum production, along with the chemical and aerospace sectors. Special types of FKM are even flexible at −40 °C. In general industry, FKM is used wherever there are high rotational speeds and high temperatures, for example, in radial shaft seal rings in pumps and transmissions.

Related documents



Sealing solutions specially developed for the process industry in accordance with hygienic design and materials with industry-specific approvals.

Sales Sheets


FKM (fluororubber) is a high-quality material that can be used in the entire processing industry.