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What is a Fluoroelastomer?
Educational, Viton™ & FKM - 7th Aug, 2012

Fluoroelastomers (FKM/FPM) are fluorinated synthetic polymers designed for harsh environments including aggressive chemical and temperature applications.


Fluoroelastomers also known as fluorocarbon compounds are used in a wide variety of high performance applications. Long term reliability, with minimum change to the environmental are the main factors that make fluoroelastomers a vital polymer. These elastomers are specifically designed to be highly resistant to elevated temperatures – 204° C continuous and 300°C intermittent and aggressive chemical changes. Fluoroelastomers have great compression, sunlight & ozone resistance as well as low gas absorption rate.

The ASTM D2000 designation for fluoroelastomers is HK meaning one of the highest heat resistance and the lowest swell available of rubber type elastomers.

So what’s the difference between FPM and FKM?

FPM is the international designation to ISO – whereas FKM is the ASTM abbreviation. Both of these designations stand for the same base material : Fluoro Rubber.

Fluoroelastomers are made and marketed by some of the world’s largest chemical corporations including: Chemours – Viton, Dyneon Chemicals Dyneon®, Solvay – Technoflon®  and Daikin – Dai-El®.

J-Flex is an official licensee of the Chemours Viton Scheme – HOWEVER, we do respect our Customers’ need for choice, so we also offer other grades in what is probably the widest stock range of Fluoroelastomer Sheet Products in Europe.

We offer:

(66% Fluorine A & B Types)

  • Viton™ ‘A’ Sheet + Viton® ‘B’ Sheet
  • FDA Compliant White Viton™ Sheet
  • Viton™ Closed Cell Sponge SheetSpecials’ – F, GF, ETP,
  • 0.25mm Thin Viton® etc. made to order
  • White (Beige) & Blue FDA/(EC) 1935/2004 Compliant
  • Viton® ‘B’ Expansion Joint Materials
  • Adhesive & Caulk Sealant

(66% Fluorine A Type)

  • 0.25mm to 25mm ‘A’ Type Sheet
  • FKM Reinforced Nomex Insertion Sheet
  • High Fluorine content grades.
  • White (Beige) & Blue FDA/(EC) 1935/2004 Compliant

We respect your specific requirements and we will quote you the best deal for your business.

Download our comprehensive Guide to Fluoroelastomers