FKM is also known as Viton rubber of Dupont. It is made by
typical emulsion polymerization and by copolymerization with
fluroroethylene and fluoropropylene. Generally, high molecular
weight compounds with high fluorine levels are very stable and
have a higher C–F synthetic intensity than C–H synthesis. It is very
expensive, but the rubber is very durable. It is mainly used in
special areas such as military machines, advanced industrial
machines, and satellites. Dupont, 3 M in the US and DAIKIN in
Japan are some representative manufacturers