Silica (especially fumed silica) is a key material in the aerospace field due to its excellent high-temperature resistance, low density, high specific surface area, and outstanding thermal insulation properties. It is widely used in core components such as aircraft thermal insulation systems, seals, structural reinforcement, and fireproofing materials.

I. Thermal Insulation and Thermal Protection Systems
Aircraft Thermal Insulation Materials
Silica-based thermal insulation materials achieve superior thermal insulation effects with lighter weight and smaller volume compared to traditional insulation materials, and are used in the manufacture of thermal insulation and soundproofing materials for aircraft.

Silica is one of the key thermal insulation materials used by NASA during the reentry of space shuttles and spacecraft into Earth's atmosphere, effectively resisting the intense erosion of high-temperature airflow.

SiO2 aerogel (a form of silica) was used in the insulation layer of the "Mars Rover" mission to withstand the extreme low temperatures (below -100°C) of the Martian night.

Vacuum Insulation Panel Core Material
Fumed silica, with its unique physicochemical properties, is an ideal choice for preparing the core material of vacuum insulation panels.

Vacuum insulation panels (VIP panels) have a thermal conductivity of less than 0.035 W/(m².K), effectively blocking heat transfer caused by air convection and are widely used in thermal insulation systems for aerospace vehicles.

Launch Vehicle Surface Protective Coatings: Shanghai Jiao Tong University's "Hyperbranched Polymer Coating Integrated Protection" technology combines hyperbranched polymers with inorganic functional fillers (including silica) to form an integrated coating.

This coating can withstand both 500°C high-temperature erosion and -183°C low-temperature impact, and has been successfully applied to multiple launch vehicles, including the Long March 6 and Long March 6A, ensuring the maiden flights of many rockets.

II. Sealing and Structural Components: High-Temperature Silicone Rubber Seals: High-temperature vulcanized silicone rubber is used in aerospace applications including various hoses, gaskets, shims, cups, valves, and shock absorbers.

These components operate in harsh, complex, and extremely demanding space environments, requiring materials that are resistant to high and low temperatures, ozone, radiation, aging, and flame retardancy.

Silica, as a key reinforcing agent, significantly improves the tensile strength, tear strength, and heat resistance of silicone rubber.

Aerospace Tires and Sealing Strips: The high-temperature resistant aircraft tire tread compound developed by China National Chemical Corporation's Shuguang Rubber uses silica, coupling agents, and silica dispersants as its reinforcing system.

After aging in hot air at 150℃ for 4 hours, the Shore A hardness increase of this tread compound is less than 5%, ensuring the stability and long-term reliability of aircraft tires under high-temperature operating conditions.

New energy vehicle sealing strip manufacturers, by adopting HB4135 fumed silica, have extended the temperature resistance range of their products to -60℃ to 250℃, maintaining a color difference ΔE < 1.5 for 2000 hours in accelerated UV aging tests.

Structural Reinforcing Materials: Fumed silica possesses high strength, high toughness, and good electrical conductivity, making it suitable for manufacturing aircraft components and conductive structural parts.

JL50 silica can be used in the aerospace field for critical components such as aircraft structural parts, engine nozzles, and missile guidance systems to improve aircraft safety and performance.

Adding SMC viscosity silica to aerospace materials increases their strength and hardness, improves high-temperature resistance and corrosion resistance, significantly enhancing the safety and reliability of aerospace vehicles.

III. Fire Protection and Safety Systems
Flame-Retardant Surface Coating
A flame-retardant surface coating for solid rocket engines comprises 25-30 parts of phenyl-modified 107 adhesive, 8-10 parts of fumed silica, and 15-20 parts of flame retardant.

This coating exhibits good dispersibility, high mechanical strength, a flame retardant rating of V0 or higher, and is relatively lightweight and environmentally friendly.

Aerospace Fire-Retardant Coating
SVT expandable graphite-based fire-retardant coating is a single-component water-based fire-retardant coating that meets international high-temperature (1200°C) and 15-minute aerospace fire-retardant design requirements.

In a fire, it rapidly expands to form a carbon foam layer more than 30 times its own size, effectively inhibiting and delaying the spread of fire. It has been applied to various aircraft models, including the Airbus A330, A350, A380, and A320.

Fireproof Membrane Materials: Silica fireproof membranes are used in the heat insulation layers of aircraft, rockets, and other transportation vehicles to improve their fire resistance and ensure personnel safety.

Silica has an extremely high surface area and excellent high-temperature resistance, maintaining stability at extremely high temperatures, allowing the fireproof membrane to function effectively under extreme conditions.

IV. Electronic and Electrical Systems
Conductive and Insulating Materials: Silica exhibits excellent high and low temperature resistance and electrical properties in the electronics and electrical fields. Its performance remains essentially unchanged over a wide temperature range and a wide range of varying electrical frequencies.

Conductive high-temperature vulcanized silicone rubber can be used as conductive connectors, offering stable performance and accurate digital display. Conductive silicone rubber products are also widely used in microwave ovens, fax machines, and leadless integrated circuits.

Electromagnetic Shielding Materials: The antistatic properties of silica/carbon black/SBR composite materials are improved after the addition of conductive carbon black, making them suitable for electromagnetic shielding systems in aerospace vehicles.

The composite material exhibits good overall performance when the silica/carbon black ratio is 35/35 and the amount of conductive carbon black is no more than 5 parts.