As a high-performance silicone material, phenyl silicone exhibits excellent electrical insulation performance in high-voltage equipment seals. The following is a detailed analysis of its performance from multiple perspectives:

I. Basic Electrical Insulation Performance Parameters
Phenyl silicone exhibits excellent electrical insulation properties. Key parameters include:
Dielectric strength: ≥18kV/mm (SC2001 model), capable of withstanding high voltages without dielectric breakdown
Volume resistivity: ≥1×10¹⁵Ω·cm (AlN-filled system), indicating strong resistance to current flow
Temperature range: -70°C to 300°C, maintaining stable electrical insulation performance even at extreme temperatures
Radiation resistance: Silicone rubber with a high phenyl content (above 30%) exhibits excellent radiation resistance

II. Special Performance in High-Voltage Environments
In high-voltage equipment seals, In use, phenyl silicone rubber exhibits the following unique advantages:
High-voltage stability: Phenyl-bonded silicone rubber can operate stably in high-voltage and high-temperature environments, and its electrical insulation performance does not significantly decrease with increasing voltage.
Environmental adaptability: It maintains excellent insulation performance in harsh environments such as high temperature, high humidity, and salt spray corrosion.
Self-extinguishing properties: Medium-phenyl silicone rubber (10-20% phenyl content) exhibits excellent flame retardancy and self-extinguishes after ignition.
Aging resistance: The phenyl structure significantly enhances UV resistance, effectively resisting performance degradation caused by long-term exposure.

III. Comparison with other sealing materials
Compared to traditional sealing materials, phenyl silicone rubber offers significant advantages in electrical insulation performance:
Material Type Dielectric Strength (kV/mm) Volume Resistivity (Ω·cm) Temperature Range (°C) Radiation Resistance
Dimethyl Silicone 15-18 1×10¹⁴ -60-200 Average
Methyl Vinyl Silicone 18-20 1×10¹⁵ -60-260 Good
Phenyl Silicone ≥18 ≥1×10¹⁵ -70-300 Excellent

Phenyl silicone is particularly suitable for the following high-voltage sealing applications:
High-voltage insulation sealing for power equipment
Moisture-proof insulation for electronic and electrical components
Radiation-resistant sealing for aerospace equipment
High-voltage battery pack sealing for new energy vehicles

IV. Practical Application Examples
Typical applications of phenyl silicone in high-voltage equipment sealing include:
Power equipment: Used for insulation sealing of high-voltage equipment such as transformers and circuit breakers, capable of withstanding operating voltages exceeding 20kV
New energy sector: As a sealing material for high-voltage battery packs in electric vehicles, meeting insulation requirements at 2000VDC system voltages
Electronic and electrical appliances: Used as dynamic seals in high-voltage potentiometers, ensuring long-term stable insulation performance
Special environments: Used as a sealant in radiation environments such as nuclear power plants Sealing materials maintain structural stability and functional integrity.

V. Usage Recommendations
To ensure optimal electrical insulation performance of phenyl silicone in high-voltage equipment sealing, it is recommended:
Select products with an appropriate phenyl content based on the specific operating voltage (low phenyl content 5-10%, medium phenyl content 10-20%, and high phenyl content 30% or higher).

Perform rigorous dielectric strength testing before installation to ensure the material is free of defects.
Regularly inspect seals for compression set and promptly replace deteriorated components.
For applications in extreme environments, high-performance phenyl silicone products with added stabilizers are recommended.
Phenyl silicone, due to its excellent electrical insulation properties, wide temperature range adaptability, and resistance to environmental aging, has become an ideal choice for high-voltage equipment sealing materials, particularly for applications with stringent insulation requirements.