fluorrubber

Fluororubber, or fluorinated rubber, refers to elastomeric polymers in which fluorine atoms replace hydrogen in the hydrocarbon backbone. The term covers several families, most notably fluorinated elastomers (FKMs) such as vinylidene fluoride–based copolymers, and higher-performance perfluorinated elastomers (FFKMs) and FEPMs, which incorporate additional fluorinated monomers to improve resistance and temperature tolerance. These materials are engineered to provide a balance of elasticity, chemical resistance, and heat resistance for sealing applications.

Properties of fluororubbers include excellent resistance to fuels, oils, solvents, and many corrosive chemicals, along with high-temperature stability compared with many other elastomers. Continuous-use temperatures for FKMs typically range up to about 200–250°C, while FFPM/FFKM formulations can tolerate higher temperatures. They retain elasticity after prolonged exposure, though low-temperature flexibility can be limited and compression set is a consideration in design. They also show good resistance to ozone and weathering.

Processing and applications: Fluororubbers are produced by polymerizing fluorinated monomers and crosslinking with peroxide- or metal-based cure systems. They are typically processed by molding or extrusion, followed by post-cure heat treatment to optimize properties. The primary use is in dynamic and static seals, including O-rings, gaskets, shaft seals, valve stems, and diaphragms. Applications span automotive, aerospace, chemical processing, oil and gas, and pharmaceutical equipment. Limitations include higher material cost and limited compatibility with certain highly polar solvents and strong bases, which must be considered in chemical exposure scenarios.