Fluorosilicone rubber (FVMQ) combines the high- and low-temperature resistance of silicone rubber with the oil- and solvent-resistant properties of fluorocarbon rubber, making it a key choice for sealing materials under extreme conditions in aerospace, automotive fuel systems, and other demanding applications.

From a material properties perspective, fluorosilicone rubber offers a service temperature range spanning -80°C to 260°C. This broad temperature stability originates from the flexibility of the siloxane main chain and the chemical inertness of the fluorinated side groups. In terms of oil and solvent resistance, FVMQ exhibits excellent tolerance to aviation kerosene, hydraulic fluids, lubricating oils, and other media; the strong electronegativity of fluorine atoms effectively impedes the permeation of oil molecules. Regarding chemical stability, it demonstrates good resistance to acids, bases, and oxidizing agents. Notably, through surface modification techniques, the hydrophobicity and oleophobicity of fluorosilicone rubber can be further enhanced, achieving high contact angles and showing application potential in self-cleaning coatings and similar scenarios.

In key application scenarios, the aerospace sector has the most urgent demand for fluorosilicone rubber. Aircraft engine seals must maintain sealing performance under the dual attack of high-temperature combustion gases and aviation kerosene, while fuel system O-rings need to sustain elastic recovery across a wide temperature range. In the automotive industry, turbocharger seals endure alternating exposure to high-temperature exhaust gases and engine oil, and fuel line gaskets must resist the swelling effects of alcohol-blended fuels. In the power industry, FVMQ is used as the outer insulating material for composite insulators; its hydrophobicity and hydrophobic transfer properties help improve anti-pollution flashover performance, ensuring safe operation of transmission lines in humid and contaminated environments. In the field of flexible electronics, the flexibility and chemical stability of fluorosilicone rubber make it a candidate material for flexible strain sensor substrates.

Formulation design requires balancing multiple performance parameters. Fluorine content is positively correlated with oil resistance, but excessively high fluorine content can reduce low-temperature elasticity; therefore, the fluorosilicone ratio must be optimized based on specific operating conditions. In terms of filler systems, fumed silica serves as the primary reinforcing filler, enhancing tensile strength and tear strength; the addition of chopped fibers can significantly improve tear resistance. Regarding vulcanization system selection, peroxide curing is suitable for general-purpose products, while addition curing is appropriate for medical and food-grade applications sensitive to by-products.

Development directions in modification include blending with fluorocarbon rubber (FKM) to combine the advantages of both materials; the introduction of novel fillers aims to improve mechanical properties without compromising temperature resistance. As the demand for applications under extreme conditions continues to grow, the technological iteration of fluorosilicone rubber will continue to advance.

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