As a high-performance elastomer material, fluorosilicate raw rubber has demonstrated irreplaceable technical value in the aerospace field due to its unique molecular structure and excellent performance.Its main chain is composed of silicon-oxygen bonds, and the side chain introduces trifluoroalkyl groups, which gives the material a wide temperature range adaptability from -60℃ to 200℃. At the same time, it has the characteristics of oil resistance, chemical resistance, and low compression deformation. It has become the core material of sealing solutions under extreme working conditions.


Core application scenarios
Fuel system seals
In the aero-engine fuel system, fluorosilicate raw rubber is made into key components such as fuel tank pressure regulating diaphragm and ventilation valve seals.Its material properties can resist the long-term erosion of kerosene vapor and maintain elasticity in the kerosene environment from -55℃ to 200℃.For example, a certain type of cloth film is combined with a polyester cloth through a fluorine silicone rubber coating to maintain structural stability when it continues to work at 150℃ in RP kerosene medium, which is more than 3 times longer than the life of traditional rubber materials.


Dynamic sealing of hydraulic system
For the high-pressure and high-speed fluid environment of military aircraft hydraulic systems, fluorosilicate raw rubber is made into infusion bellows, dynamic sealing rings and other components.Its optimized design of vinyl content (0.04%-5.0%) can achieve precise regulation of crosslinking density. When under the pulsating pressure of hydraulic oil, the compression permanent deformation rate is less than 15%, which is significantly better than the 25% standard of fluorine rubber.This characteristic has been verified in the hydraulic system of the landing gear of a certain type of fighter, and the sealing performance attenuation is less than 5% after 100,000 cycles of testing.


Spacecraft environmental protection
In scenarios such as satellite propellant storage tanks and space station docking mechanisms, fluorosilicate raw rubber plays multiple protective functions.Its low surface energy characteristics (contact angle>110°) can effectively inhibit the adhesion of propellant residues, and at the same time it is resistant to corrosion by strong oxidants such as nitrogen tetroxide and hydrazine.The propulsion system of a certain type of deep space detector adopts fluorine silicone rubber O-ring. After undergoing a high temperature test of 120℃ and a low temperature test of -180℃, the sealing leakage rate is still controlled below 1×10-1 Pa·m3/s, which meets the aerospace-grade sealing standard.


Technological breakthrough direction
Current research and development focuses on improving the stability of materials in the radiation environment.Through the introduction of phenyl group modification, the tensile strength retention rate of the new fluorosilicate raw rubber increased to 85% after gamma-ray irradiation (total dose of 100 rad), which is 20 percentage points higher than that of traditional products.At the same time, the introduction of 3D printing and molding technology has enabled the manufacturing accuracy of complex structural seals to reach ±0.05mm, which provides the possibility for a new generation of spacecraft to reduce weight by more than 15%.


With the development of reusable spacecraft technology, the application potential of fluorosilicate raw rubber in thermal protection systems has gradually emerged.Its instantaneous temperature resistance limit can reach 300℃, and with the design of the sweating cooling structure, it can replace some ceramic matrix composite materials, reducing manufacturing costs while improving system reliability.In the future, with breakthroughs in material modification technology, fluorosilicate raw rubber is expected to be more widely used in deep space exploration, hypersonic aircraft and other fields.