Fluorosilicone rubber is the most commonly used fluorosilicilane series of new materials so far. Since fluorine is the most electronegating element, its C-F bond with carbon atoms is quite stable and heat resistance is also high. The introduction of fluorine into siloxane not only has the superior heat resistance, weather resistance, water repellency and mold release properties of general siloxane, but also has the properties of waterproofing, oil resistance and solvent resistance of fluorine-containing compounds. Therefore, on the basis of maintaining the high and low temperature resistance (-55 °C ~ 205 °C) resistance of silicone rubber, weather resistance, compression resilience, resilience, electrical characteristics, defilament and a series of excellent properties, fluorosilicone rubber also has the resistance of fuel oil and solvent resistance of fluoroelastomer. Compared with fluoroelastomer, it has better cold resistance, compression and permanent deformation, and the dependence of physical properties on temperature is small, from low temperature to high temperature, it has shown excellent performance, which can be called one of the best synthetic rubbers in the world today. Secondly, products with low hardness can be obtained even without the use of plasticizers. Therefore, it has been applied in important industrial sectors such as aerospace, aircraft, automobiles, petrochemicals, machinery, artificial organs, and other important industrial sectors, as well as in the fields of co-defense, transportation, medicine, electronics and electrical. Especially as a seal, O-ring, gasket, diaphragm, connector, pipe and other products in contact with fuel oil and lubricating oil in high-grade cars or aircraft. In addition to the widely used military industry, automotive diaphragms in the civilian market are the largest market for fluorosilicone rubber.
Compared with general silicone rubber and fluoroelastomer, the price of fluorosilicone rubber is much higher. At present, most of the domestic civilian markets use cheap polysulfide rubber and nitrile rubber in the need for oil resistance. Polysulfide rubber high temperature resistance up to 100 °C, nitrile rubber up to 130 °C, and fluorosilicone rubber high temperature resistance up to 180 ~ 230 °C, its advantages are self-evident. Compared with fluorine rubber and fluorosilicone rubber, the physical and mechanical properties of fluorosilicone rubber at high temperature are better than those of fluorine rubber, and the physical properties of fluorine rubber at room temperature are 2 times better than fluorosilicone rubber, and the performance of the two is equal at 150 ° C. At 200 °C, the physical properties of fluorosilicone rubber are 2 times better than fluorine rubber, and at 230 °C, it is surprisingly better than 4 times better than fluorine rubber. Since the fluoroelastomer itself has no vulcanization point, it is necessary to add alkali to remove HF during vulcanization to form a vulcanization point. The small amount of alkali contained in the vulcanized rubber will corrode the metal contact surface, while the vulcanization of the fluorosilicone rubber does not require the addition of acid and alkali fillers, which is not corrosive. Based on these two points, fluorosilicone rubber will replace fluorine rubber in some special applications and general industries.