Fluorocarbon rubber (or FKM) is a popular premium grade compound that's particularly useful in applications in which ongoing exposure to petroleum oils at high temperatures is present. These qualities make it very useful in "under-hood" automotive industry applications. Also, FKM resists swell in the exceptionally aromatic, additive-heavy, non-leaded gasolines that today's environmental regulations mandate today. FKM has low temperature deficiencies, however, special compounding can address these to a degree. Generally, fluorine content is in the range of 66% to 70%.
In sustained high heat environments, fluorocarbon rubber is highly resistant to embrittlement. It is deemed indefinitely serviceable in continuous exposure to 400°F. The preferred cure system for the majority of fluorocarbon compounds is bisphenol because it combines the best compression set and better acid and steam resistance. Alternative cure systems include diamine and peroxide. Fluorocarbon vulcanizates are highly resistant to atmospheric and ozone aging.
RT Dygert is a licensed Genuine DuPont Viton Distributor.
|High density copolymer of vinylidene and hexafluoropropylene|
|Low temperature flexibility||•|
|-15 to 400 °F|
*Excellent, good, fair and poor are intended to serve as general guidelines only. Actual testing in the application environment is always recommended.