What is FKM (Viton®)?
FKM (according to ASTM D1418) (equivalent to FPM according to ISO/DIN 1629) is the name for approximately 80% of fluoroelastomers as defined in ASTM D1418.
Release time:
2022-03-17
Source:
What is FKM (Viton®)?
FKM (according to ASTM D1418) (equivalent to FPM according to ISO/DIN 1629) is the name for approximately 80% of fluoroelastomers as defined in ASTM D1418.
Fluorocarbon rubber is the most important single elastomer. Highly fluorinated, carbon-based polymers for resistance to harsh chemical and ozone attack, the Viton ® name is a trademark of Dupont.
Fluorocarbon elastomers are important in the sealing industry, where O-rings are the solution for mechanical equipment that requires maximum resistance to high temperatures and multiple fluids, such as those used in aircraft, automotive and other FKMs in the high temperature range between -26°C to +205°/230°C (-15°F to +400°/440°F). For shorter operating times, it will require higher temperatures. It has broad chemical compatibility, temperature range, low compression permanent deformation and excellent aging properties. On top of that, it is flame retardant, but dangerous after fire. Due to the fluorine residue in the carbon residue, the material is a heavier material and harder elastomer.
FKM has good resistance to mineral oils and greases, aliphatic, aromatic and special chlorinated hydrocarbons, gasoline, diesel, silicone oils and greases. It is also suitable for high vacuum applications. Other fluorinated elastomers are perfluorinated elastomers (FFKM) and tetrafluoroethylene/propylene rubber (FEPM). Originally developed by DuPont (Viton), FKM is now also used by Daikin Chemical (Dai-El), 3M's Dyneon (Dyneon Fluoroelastomers), Solvay Specialty Polymers (Tecnoflon), and FEPM. Polymers (Tecnoflon), HaloPolymer (Elaftor), and several Chinese manufacturers.
Fluoroelastomers are more expensive than neoprene or Buna-N elastomers. They offer additional heat and chemical resistance. fKMs can be classified into different categories based on their chemical composition, fluorine content or cross-linking mechanism. Many fluorocarbons have higher than normal mold shrinkage, and molds for fluorocarbon products are often different from those for NBR.
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