Phenyl silicone rubber is crucial for sealing applications in the aerospace industry.  With its exceptional resistance to extreme temperatures, radiation resistance, and high reliability, it has become an indispensable key material for modern aircraft and spacecraft.
I. Core Characteristic Advantages
Extreme Temperature Adaptability: Phenyl silicone rubber has a temperature range of -100℃ to 250℃. Low-phenyl types maintain elasticity at -100℃, and high-phenyl types can withstand 2.58×10⁴ C/kg of γ-ray radiation, making them suitable for space and high-altitude environments.
Special Temperature Performance: It remains elastic at temperatures as low as -120℃, solving the problem of traditional materials hardening and cracking in extremely low-temperature environments, which is a key advantage for its application in the aerospace field.
Structural Stability: The phenyl structure disrupts the regularity of the siloxane chain, lowering the crystallization temperature and glass transition temperature, allowing the material to maintain stable physical properties under extreme temperature changes.

II. Main Application Areas
Aircraft Sealing Systems:
Used for sealing cabin doors, windows, etc., it is the "lifeline" of space stations; space station development once faced a situation of "no suitable materials available."
Aircraft engine seals, preventing gas leakage and ensuring efficient engine operation while withstanding high temperatures and strong vibrations.
Door and window system sealing materials.
Thermal Protection Systems:
Used as a binder for aircraft insulation materials, spacecraft insulation products, and engine insulation materials.
Firewall applications, utilizing its high-temperature resistance and insulation properties to effectively block the transfer of flames and heat, protecting other aircraft components.
Special Functional Components:
Used for sealing rings, gaskets, tubes, rods, etc., in radiation-resistant areas, particularly maintaining material stability in high-radiation environments.
Damping material applications: Medium-phenyl methyl phenyl silicone rubber has significant damping properties, used to reduce vibration and noise inside spacecraft.

III. Application Challenges and Development Trends
Processing Difficulty: Medium-phenyl and high-phenyl silicone rubbers are subject to certain limitations in production and application due to processing difficulties and relatively poor physical and mechanical properties. Customization Requirements: Depending on the specific application environment, the phenyl content needs to be adjusted (low phenyl 5-10%, medium phenyl 15-25%, high phenyl 30-50%) to achieve the optimal performance balance.
Future Directions: With the development of aerospace technology, the requirements for temperature resistance range, radiation stability, and mechanical properties of phenyl-containing raw rubber will further increase, driving continuous innovation in materials science.