Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 83 What Makes Fluoroelastomers Work? There are three main factors that allow Fluoroelastomers to gain their unique quality. 1. Extremely strong bonds between atoms – the carbon atoms which make up the backbone of this polymer are extremely resistant to change. This means that these polymers are unlikely to undergo any division of their macromolecular chains into smaller sections, which would then be more susceptible to deterioration. 2. High fluorine-to-fluorine ratio – fluorine is the dominant atom, making it more stable and less likely to be affected by its environment. The higher the level of fluorine, the more stable the polymer. All reputable A Type (or Type 1# / 2#) FPM / FKM materials should contain a minimum of 66% fluorine. 3. Single carbon backbone – the backbone contains only single bonds between the carbon atoms. Double bonds are increasingly more likely to be affected by chemical attacks; single bonds are less likely to be harmed by oxygen, ozone, UV lights, etc... FPM / FKM : What’s the story? So what’s the difference between FPM / FKM? FPM is the international designation according to ISO – whereas – FKM is the ASTM designation. Both of these designations stand for the same thing – Fluoroelastomers. ASTM D2000 designation for Fluoroelastomers is HK, meaning one of the highest heat resistance & lowest swell materials available. Life Expectancy Fluoroelastomers withstand high temperatures and simultaneously retains its good mechanical properties better than most other elastomers. Oil and chemical resistance are also relatively unaffected by elevated temperatures. Reputable Fluoroelastomer compounds remain usefully elastic indefinitely when exposed to hot air ageing up to 204°C, or to intermittent test exposures up to 260°C. High temperature service limits are generally considered to be: Hours At 3,000 232°C 1,000 260°C 240 288°C 48 316°C Who Makes Fluoroelastomers? Fluoroelastomers are made by some of the world’s largest chemical corporations. For example: J-Flex is a member of the official Chemours Viton™ Licensee Program, but we do also offer other grades and have one of the widest ranges of Fluoroelastomers available worldwide. Chemours Viton™ Dyneon Dyneon® (Fluorel) Solvay Solexis Tecnoflon® Daikin Dai-El® Asahi Glass Aflas® Zhonghao Chenguang 3F Alltop Lanxess Levatherm® Standard Sheet Coloured Sheet. Adhesive and Caulk Sealant Blue FDA Sheet O - R i n g Cord