Fluoroelastomer (FKM) is a class of synthetic rubber known for its high resistance to heat, chemicals, and oils. It is composed primarily of fluorinated hydrocarbons, which provide excellent durability in harsh environments. FKM is commonly used in sealing applications, such as O-rings and gaskets, where it must withstand extreme temperatures and corrosive substances. It is highly valued in automotive, aerospace, and chemical processing industries due to its ability to perform in demanding conditions.