FKM’s chemical structure has evolved significantly since the 1940s, with fluorine content increasing from 26.7% to 66%-68%. While bisphenol and peroxide have superseded amine as the curing process of choice. FKM’s high fluorine content ensures excellent chemical resistance to a broad range of aggressive chemicals, including acids, fuels, crude oil and ammonia, to name but a few. It also delivers a wide temperature range of -45℃ to 204℃, which is superior to most other elastomers.