FKM (Fluoroelastomer) rubber is a type of synthetic rubber that is known for its excellent heat resistance, chemical resistance, and resistance to ozone and weathering. It is a fluoroelastomer, which means it is made from a polymer that contains a high percentage of fluorine. FKM rubber is often used in high-temperature applications, such as in automotive and industrial equipment, as well as in chemical and pharmaceutical processing. It is also commonly used in the oil and gas industry as well as in aerospace and military applications. FKM rubber has a wide range of chemical compatibility, which makes it suitable for use with a wide variety of acids, bases, fuels, and solvents. It also has excellent ozone and weathering resistance, making it suitable for use in outdoor applications. FKM rubber is available in different grades, each with varying levels of heat and chemical resistance. It can be used in various forms such as seals, gaskets, o-rings, and hoses. It's important to note that FKM rubber is not suitable for use with silicone-based lubricants or fuels containing oxygenates such as MTBE, ETBE, and TAME.