![Perfluorocarbons Kalrez® (FFKM)](http://proseal.se/cdn/shop/products/Chemraz-Brochure-3_dfd421fd-fb08-4352-8c75-041d1c158f16_300x.jpg?v=1670591882)
Perfluorocarbons Kalrez® (FFKM)
The relative inertness of fluorocarbon rubbers is provided by fluorine-carbon bonds on the elastomer backbone. Generally speaking, with increasing fluorine content, resistance to chemical attack is improved. Where fluorocarbon rubbers have a fluorine content of 63 - 68 %, the perfluorocarbons have a fluorine content of 73%. Perfluorelastomers possess excellent resistance to extreme temperatures -26°C to +260°C (-15°F to +500°F). FFKM perfuoroelastomers: (Kalrez®) offers the best chemical resistance of all elastomers.
Some types are particularly suitable for hot water, steam and hot amines. Some resist temperatures up to +326°C (+620°F).
Many perfluorocarbon compounds have unusual mold shrinkage, production molds for perfluorocarbon products are different from molds for nitrile.
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