What is FKM?

Fluroelastomer or FKM is a class of synthetic rubber designed for very high temperature operation. FKM provides extraordinary levels of resistance to chemicals, heat and oil, while providing useful service life above 200°C. FKM are not a single entity but a family of fluoropolymer rubbers. Fluoroelastomers or FKM (sometimes also referred to as FKM Viton) can be classified by their fluorine content, 66%, 68%, 70% respectively. It means that FKM rubber having higher fluorine content, have increasing fluids resistance derived from increasing fluorine levels.

Key Characteristics of FKM:

Chemical Resistance: FKM has excellent resistance to a wide range of chemicals, including oils, fuels, solvents, and many acids and bases. This makes it ideal for use in chemical processing and automotive applications.

Temperature Resistance: FKM can withstand high temperatures, typically ranging from -20°C to 200°C (-4°F to 392°F), with some specialized grades capable of even higher temperatures. This makes it suitable for applications in engines, aerospace, and industrial environments.

Low Permeability: FKM has low gas permeability, meaning it is resistant to the diffusion of gases. This property is crucial in applications like sealing systems in the automotive and aerospace industries.

Mechanical Properties: FKM exhibits good mechanical strength, including high tensile strength, and retains flexibility over a wide temperature range. It also has excellent resistance to compression set, which means it maintains its shape and sealing ability over time.

Aging Resistance: FKM has excellent resistance to ozone, UV radiation, and weathering, making it durable in outdoor and harsh environmental conditions.

Flame Resistance: FKM is self-extinguishing, meaning it does not easily catch fire, and when it does, it tends to extinguish itself. This property is valuable in applications where fire safety is a concern.