FKM O-Rings
FKM O-rings are high-performance sealing solutions engineered for demanding applications where standard elastomers may not provide sufficient resistance to temperature, chemicals or aggressive media. Commonly referred to as Viton® O-rings, FKM compounds are trusted across industries where reliability, longevity and operational safety are critical.
At M Seals, we supply a comprehensive range of FKM sealing products to OEMs, maintenance engineers and manufacturers throughout the UK. Whether you're specifying seals for chemical processing equipment, fuel systems or industrial machinery, FKM offers exceptional performance in challenging operating environments.
What is FKM?
FKM is a fluorocarbon elastomer known for its excellent resistance to heat, oils, fuels and a wide range of chemicals. Compared with general-purpose materials such as NBR, FKM offers enhanced durability in demanding applications, helping to extend service intervals and reduce downtime.
Its ability to maintain sealing performance in harsh environments has made it one of the most widely specified elastomers for critical sealing applications.
Benefits of FKM O-Rings
- Excellent high-temperature resistance
- Outstanding chemical compatibility
- Exceptional resistance to oils, fuels and hydrocarbons
- Excellent resistance to ozone, UV and weathering
- Long service life in demanding applications
- Good compression set resistance
- Suitable for vacuum environments
- Reliable sealing performance under challenging conditions
Typical Industries and Applications
FKM O-rings are commonly used in:
- Chemical processing equipment
- Automotive fuel and engine systems
- Aerospace applications
- Oil and gas equipment
- Pumps and valves
- Industrial manufacturing machinery
- Vacuum systems
Temperature Performance
Standard FKM compounds typically operate between:
-20°C to +200°C
Specialist grades may offer enhanced performance beyond these limits depending on the application.
Chemical Compatibility
FKM performs exceptionally well when exposed to:
- Mineral oils
- Synthetic lubricants
- Fuels and hydrocarbons
- Many aggressive chemicals
- Ozone and weathering
- Vacuum conditions
Alternative materials may be recommended for applications involving prolonged exposure to hot water, steam or certain amines.
Frequently Asked Questions
What is an FKM O-ring?
An FKM O-ring is a seal manufactured from fluorocarbon elastomer. It is widely used in applications requiring excellent resistance to heat, fuels, oils and aggressive chemicals.
What temperature range can FKM O-rings withstand?
Standard FKM O-rings typically operate between -20°C and +200°C, with specialist compounds capable of performing at even higher temperatures.
What chemicals are FKM O-rings resistant to?
FKM offers excellent resistance to fuels, mineral oils, synthetic oils, hydrocarbons and many industrial chemicals, making it suitable for demanding sealing applications.
What are FKM O-rings commonly used for?
FKM O-rings are frequently used in automotive, aerospace, oil and gas, chemical processing and industrial manufacturing applications where reliability and chemical resistance are critical.
What is the difference between FKM and NBR O-rings?
Both materials provide good resistance to oils and fuels, but FKM offers significantly higher temperature resistance and broader chemical compatibility, making it better suited to harsh operating environments.
Should I choose FKM or EPDM O-rings?
FKM is generally preferred for oils, fuels, solvents and high-temperature applications, whereas EPDM is often better suited to hot water, steam and outdoor weather exposure.
