The application of fluorosilicone materials in national defense and military industry is extensive and important, mainly due to its excellent high temperature resistance, low temperature resistance, corrosion resistance, aging resistance, high strength, friction resistance and other properties. The following is a detailed analysis of the application of fluorosilicone materials in national defense and military industry:

1. Basic characteristics of fluorosilicone materials
Fluorosilicon materials are an emerging material developed on the basis of organic silicon materials and organic fluorine materials. Its polymer contains F-C bonds, Si-O bonds and Si-C bonds, but no Si-F bonds. This special chemical structure gives fluorosilicone materials unique physical and chemical properties, such as excellent high temperature and low temperature resistance, good oil resistance and solvent resistance, as well as low surface tension and good air tightness.

2. Specific applications in national defense and military industry
- Sealing materials
In the sealing of rocket fuel systems of missiles and spacecrafts, special materials that are resistant to N2O4 and high and low temperature are required. Only perfluoroether rubber or special fluorosilicone rubber can do this. Fluorosilicon rubber has extremely good oil and solvent resistance and can maintain sealing performance in extreme environments.
- Optical materials
Fluorosilicon materials are also used in the manufacture of optical instruments and equipment in the national defense military industry. For example, fluorinated polyacrylate is a good outer layer material for optical fibers, while Teflon AF type transparent fluorine resin is suitable for missile infrared window materials. These materials have good optical transmittance and aging resistance, and can meet the high requirements of the national defense military industry for optical materials.
- Insulating materials
In special occasions such as aircraft, rockets, and submarines, there are high flame retardant requirements for the sheaths of power wires and signal wires. Polyperfluoroethylene propylene is a material with non-flammability, high heat resistance, and high insulation, which is suitable for the sheaths of wires and cables in these occasions.
- Protective materials
Fluorosilicon materials are also used in protective equipment in the national defense military industry. For example, textiles made of biaxially stretched high molecular weight polytetrafluoroethylene film are impermeable to water and oil but breathable and moisture-permeable, and are used in military equipment (such as three-proof clothing, combat clothing, and military boots). This material not only improves the comfort of protective equipment, but also enhances its protective performance.
- Other applications
Fluorosilicon materials are also widely used in other fields in the national defense military industry, such as diaphragm materials for fuel cells and electrolyte components for lithium batteries. These applications make full use of the excellent chemical stability and physical properties of fluorosilicone materials.

3. Summary
Fluorosilicon materials play an irreplaceable role in national defense and military industry with their unique properties and wide application fields. With the continuous advancement of science and technology and the increasing demand for national defense and military industry, the application prospects of fluorosilicone materials will be broader. In the future, we can expect more high-performance fluorosilicone materials to be developed and make greater contributions to the national defense and military industry.