For sealing and protection products, Fluorosilicone is suitable for use in aerospace, automobile, electromechanical, electronic, mechanical, and architectural fields, it can be used in kerosene at-55 °C ~ 220 °C and in steam and open flame at 150 °C, and in the strength of more than 100 kg under the pressure of heat resistance, oil resistance, ozone, and other harsh environment continued to use.
Fluorosilicone is called trifluoro propyl methyl polysiloxane, also known as special silicone rubber, its main material is carbon tetrafluoride and ethylene which combine trimethyl trifluoro propylcyclo trisiloxane, and an amount of tetramethyl tetravinyl ring, tetra-siloxane, and a small amount of blocking agent was cured and mixed under the catalyst. Compared with ordinary silicone rubber, the impact properties are improved effectively.
Compared with ordinary silicone products, the outstanding feature of Fluorosilicone is performance and service life. The normal service life of ordinary silica gel products, such as reaching the bearing capacity of Fluorosilicone rubber, will accelerate the aging capacity, the tensile strength will drop, the deformation will be larger, and so on. Silicone elastomers are also known as silicone rubbers which are composed of silicon, carbon, hydrogen, and oxygen. They are non-reactive, stable, and resistant to extreme environments and temperatures from −55–300°C (−67–572°F). Fluorosilicone also has these characteristics.
Fluorosilicone rubber distinguishes itself from silicone because it also contains additional beneficial properties common to fluorocarbons. The addition of these compounds enhances FVMQ’s capacity to resist solvents, fuel, and oil. Fluorosilicone has a slightly lower maximum service temperature hot air resistance than ordinary silicone.
The important features of Fluorosilicone products are as follows:
- Resistance to oil, solvents, and chemicals
Compared with methyl vinyl silicone rubber, Fluorosilicone has excellent oil resistance, solvent resistance, and chemical resistance, and good oil resistance and solvent resistance even compared with fluoro rubber. It can be said that Fluorosilicone rubber is the only elastomer that is resistant to non-polar medium at-68 °C ~ 232 °C. The resistance of Fluorosilicone to gasoline containing methanol is also good. Even in the gasoline/methanol mixed material, the hardness, tensile strength, and volume of the vulcanizate have little change, the physical properties have hardly changed after 500h long time immersion testing.
- Heat resistance
The high-temperature decomposition of Fluorosilicone is the same as that of ordinary silicone, i. e. side-chain oxidation, main chain fracture, side-chain thermal decomposition, and various compound reactions. As the decomposition products can also cause the main chain fracture, so the heat resistance, usually worse than ordinary silicone rubber, at 200 °C temperature has begun oxidation aging. However, by adding a small number of heat stabilizers such as iron, titanium, and rare earth oxides, it can be improved remarkably and has enough heat resistance even at 250 °C. The influence of temperature on Fluorosilicone is greater than that of silicone but less than that of fluoro rubber. The service life of Fluorosilicone rubber was also studied at 150 °C × 2000H, 175 °C × 5000H and 200 °C × 4000H, the results were second only to that of methyl vinyl silicone rubber.
- Cold tolerance
Fluorosilicone and ordinary silicone products are good low-temperature performance. Because Fluorosilicone rubber is a linear polymer with soft SI-O as the main chain, its low-temperature property is better than that Fluororubber with C-C as the main chain. Among them, Fluorosilicone (LS-2370U) has better low-temperature characteristics, the brittleness temperature reaches -89 °C, and the general Fluororubber is -30 °C.
- Electrical properties, radiation resistance
The electrical properties of Fluorosilicone are similar to those of ordinary silicone rubber, but its special value is that it changes little under harsh conditions such as high temperature, low temperature, humidity, oil, solvent, chemicals, ozone, and so on. The radiation resistance of Fluorosilicone is not outstanding, but the radiation aging resistance is better than methyl vinyl silicone rubber.
- Physical and mechanical properties
Fluorosilicone rubber and ordinary silicone rubber, vulcanizate mechanical strength (especially tear strength) is relatively low. Therefore, improving the strength of Fluorosilicone rubber is also an important research topic.
- Other features
Fluorosilicone rubber weather aging resistance is very good, even after exposure for 5 years, still maintain good performance. Ozone is one of the most common gases produced during the aging of elastomers, but no cracks or cracks are found in Fluorosilicone rubber by dynamic or static tests. In addition, Fluorosilicone rubber mold resistance, physiological inertia, an anticoagulant is also very good.