Frequently Asked Questions — HFKM O-Rings
What is HFKM high-performance fluorocarbon rubber?
HFKM is a high-performance fluorocarbon elastomer grade with a higher fluorine content than standard FKM Type 1, positioned between conventional FKM and FFKM. The increased fluorine content improves resistance to polar solvents, oxygenated fuels, and hot water while maintaining the broad chemical resistance of the FKM family.
What temperature range can HFKM o-rings handle?
HFKM o-rings operate from −20 °C to +230 °C in continuous service, exceeding standard FKM's upper limit by approximately 30 °C. This makes them suitable for high-cycle automotive and industrial sealing where standard FKM is borderline in thermal performance.
What chemicals is HFKM resistant to?
HFKM improves on standard FKM in resistance to oxygenated fuels (ethanol blends, E85, E100), hot water and steam to 150 °C, methanol, esters, and some ketones. It retains FKM's resistance to mineral oils, aromatic hydrocarbons, chlorinated solvents, and aliphatic fuels.
What are typical applications for HFKM o-rings?
HFKM o-rings are used in flex-fuel automotive engines (high-ethanol fuels), chemical process equipment where standard FKM shows borderline resistance, high-temperature hydraulics, and precision instrumentation requiring the combination of extended temperature range and improved solvent resistance.