FKM Elastomers

fkm seal material

FKM | FDA, a fluoro-rubber-based elastomer, also known as FKM and VITON®, is recognized for its superior qualities as an FKM material, especially in applications like FKM seal material. This material excels in providing resistance to high temperatures, weathering, ozone, and a wide array of chemicals, making it an ideal choice for FKM seals made of semi-finished product: FKM tubes, and FKM bushings. FKM | FDA exhibits commendable chemical resistance when used as an FKM seal material, particularly against mineral oils, greases containing sulfur, HFD fluids, crude oil, and sour gas. However, it does have limitations as an FKM material, showing less resistance to anhydrous ammonia, amines, ketones, esters, hot water, and low-molecular-weight organic acids. In addition to its versatile use in FKM seals, FKM tubes, and FKM bushings, FKM | FDA aligns with the standards required for food-grade applications, further highlighting its utility in diverse environments.


Good resistance
Average resistance
Low resistance
Mineral oils
Hot water
Aliphatic hydrocarbons (propane, butane, petrol)
skidrol 500
Silicone oil and grease
ammonia, amines, alkali
Adipose and vegetable oils and grease
Hot steam
Low-molecular organic acids (acetic and formic acids)
Oils with soot and highly aromatic oils
Hydrofluoric acids, chlorosulfonic acids.
Fire-resistant hydarulic fluids HFD-S, HFD-R
Fire-resistant hydraulic fluids HFA, HFB, HFC
Polar solvents (acetone, methyl ethyl ketone, dioxane, ethylacetate)
Biodegradable hydraulic fluid
Brake fluids based on glycol
Aromatic hydrocarbon (toulene, benzol)


FPM can be used for production of U-shaped seals, chevron seals, wipers and non-standard seals. FKM is mainly used in cases with temperature and chemical stress. Also it is used in hydraulic systems with fire-resistant hydraulic fluids HFD.
In practice verified that the seals by type “V-Ring” out of FPM capable of working at very high speeds, up to 78 m/s.

Mainly used

  • Non-standard seals in chemical industry and thermal engineering in metallurgy;
  • Rotary shaft seals;
  • O-rings;
  • Hydraulic seals for HFD-fluids

FKM Material Data Sheet

Hardness at 20°:
85 +/-2
Shore A
DIN 53505
DIN ISO 1183-1
100% Modulus:
DIN 53504
300% Modulus:
> /
DIN 53504
Tensile strength:
DIN 53504
Elongation at break:
DIN 53504
Rebound resilience:
DIN 53512
Tear strength:
DIN ISO 34-1
DIN 53516
Compression set:*
< /
DIN ISO 815-1
Compression set:**
< /
DIN ISO 815-1
Compression set:***
< /
DIN ISO 815-1
Compression set:****
< 8
Min. service temperature:
Max. service temperature (short term):
+200 (+230)

*Compression set @ 23°C, 72 hours, 10% deflexion
**Compression set @ 70°C, 24 hours, 20% deflexion
***Compression set @ 100°C, 24 hours, 20% deflexion
****Compression set @ 225°C, 22 hours, 10% deflexion

All above established data results from random tests which were taken from the functioning production. All data was stated based on standard test-products in accordance with ISO, DIN and ASTM standards and can substantially not be extended to the completed seal. Our practical technical recommendation, either oral, written or through tests is given in conformity with our best knowledge. However, this data is to be regarded as non-obligatory advice, also taking into consideration any protective rights of a third party, and does not acquit you from making tests with our product in relation to its adaptability for the assigned process and intendment. Utilization, application and processing of the products befall completely outside of our control and are therefore solely your liability. As regards the responsibility, it will be limited to all damages in the value of the product which we delivered and you applied. Certainly, we do assure the immaculate quality of our products in concordance with our general sales and delivery conditions.

Technical Description of FKM (Fluoroelastomer) Rubber

FKM, commonly referred to as Fluoroelastomer or FKM material, is a synthetic rubber prized for its exceptional performance in demanding applications. It is a preferred choice for FKM seal material and FKM Viton material, known for its robustness in various industrial uses.
FKM, a unique class of FKM Viton material, is a copolymer composed of vinylidene fluoride, hexafluoropropylene, and sometimes tetrafluoroethylene. This composition is tailored to enhance specific properties, such as flexibility and chemical resistance, making it ideal for FKM seals and other applications.
Temperature Resistance: FKM material stands out for its ability to withstand extreme temperatures, a key feature for FKM seal material, ensuring reliable performance from -20°C to +200°C and beyond.

Chemical Resistance: As an FKM seal material, it exhibits unparalleled resistance to oils, fuels, and most acids, alongside excellent oxidation, UV, and weathering resistance.

Mechanical Properties: The high tensile strength and low compression set of FKM material contribute to its effectiveness in FKM tubes and FKM bushings, making it suitable for strenuous mechanical conditions.

Low Permeability:The low gas and fluid permeability of FKM is crucial in sealing applications, such as in FKM tubes and FKM bushings, particularly in the automotive and aerospace sectors.
FKM Seals: Widely used in O-rings and gaskets due to its chemical and heat resistance.

FKM Tubes and FKM Bushings: Ideal for components requiring durability in harsh environments, such as in automotive and aerospace applications.

Chemical Processing: Used in seals, hoses, and components due to its resistance to aggressive chemicals.

Oil and Gas: FKM material is essential in seals and components exposed to extreme conditions.

Grades and Variations: Different grades of FKM are available, each designed for specific environments, influencing the material’s interaction with various fluids and chemicals.
FKM can be molded and extruded into various forms, including FKM tubes and FKM bushings, with precise control over processing conditions to maintain its unique properties.
The remarkable properties of FKM, especially as an FKM seal material and in applications like FKM tubes and FKM bushings, make it an indispensable material in industries where ordinary elastomers fail.