As a high-performance specialty rubber material, phenyl silicone demonstrates outstanding application value in oil-resistant seals and low-temperature sealing rings in the automotive industry. The following provides a comprehensive analysis of its technical characteristics, application cases, and solution providers.

I. Basic Properties of Phenyl Silicone and Automotive Applications
Phenyl silicone, by introducing phenyl groups onto polysiloxane pendant groups, significantly improves its temperature resistance, making it an ideal material for sealing in extreme environments in the automotive industry:

Temperature Range: Maintains stable performance over a wide temperature range of -100°C to 250°C, far exceeding the applicable temperature range of ordinary silicone rubber.
Oil Resistance: Excellent resistance to various mineral oils, hydraulic fluids, and lubricating oils, avoiding swelling or degradation.
Mechanical Properties: Maintains excellent flexibility at low temperatures, preventing brittle cracking; maintains structural stability at high temperatures.
Radiation Resistance: Suitable for sealing in specialized environments, such as military vehicles and new energy vehicles.

In the automotive industry, phenyl silicone is primarily used in:
Engine oil seals and transmission seals
Body coatings and glass sealants
New energy vehicle battery system seals
Special vehicle door, window, and trunk seals

II. Technical Requirements for Oil-Resistant Seals and Low-Temperature Sealing Rings
1. Oil-Resistant Seal Technical Requirements
Surface Treatment: The contact surface roughness (Ra) must be controlled within 0.2-0.63μm, free of burrs and sharp corners.
Material Properties: Requires a hardness of HRC45 or higher, oil resistance, high temperature resistance, and good elasticity.
Installation Specifications: Use specialized tooling to ensure flushness with the housing reference surface and avoid hammering during installation.
Seal Structure: A balanced design is typically used to prevent frictional heating of the end faces, leading to changes in the liquid film pressure.

2. Low-Temperature Seal Ring Technical Requirements
Material Selection: For temperatures below -50°C, special materials such as polytetrafluoroethylene composites are required.
Structural Design: For temperatures below -70°C, a bellows seal structure is required to prevent freezing of the V-ring.
Thermal Stability: Must withstand thermal cycling shock and have a low linear expansion coefficient.
Mechanical Properties: Must maintain sufficient strength and rigidity at low temperatures to avoid deformation.

III. Specific Application Examples of Phenyl Silicone in Automotive Seals
1. Oil-Resistant Seal Applications
‌Engine Oil Seals‌: A German brand uses phenyl silicone oil seals, which triple its service life in high-temperature oil environments up to 150°C.
‌Transmission Seals‌: Japanese automakers use phenyl silicone O-rings to address the swelling issue of traditional materials in ATF oil.
‌New Energy Vehicle Battery Seals‌: A domestic battery manufacturer uses phenyl silicone seals, which have passed IP68 waterproofing and -40°C low-temperature testing.

2. Low-Temperature Sealing Ring Applications
‌Cryogenic Equipment Seals‌: An LNG storage tank uses phenyl silicone seals, which maintain elasticity at -196°C.
‌Aerospace Applications: Military aircraft hydraulic systems use phenyl silicone bellows, which withstand temperatures ranging from -60°C to 200°C.
‌Polar Vehicle Seals: Scientific research vehicles use phenyl silicone in their door and window seals, ensuring they remain operational at -80°C.