Unlike FKM, which has some hydrogen, FFKM withstands strong acids like concentrated nitric, hydrofluoric, and sulfuric, as well as bases, amines, ketones, esters, ethers, fuels, and solvents. It resists over 1,800 chemicals, including steam and hot water up to high temperatures. This universal compatibility makes FFKM O-rings ideal for broad-spectrum exposure scenarios https://globalsealstech.com/ffkm-seals/