Phenyl silicone oil lubricants have excellent electrical insulation properties, which are specifically reflected in the following aspects:

1. Electrical insulation performance parameters

Volume resistivity: The volume resistivity of phenyl silicone oil is usually in the range of 10 ¹⁴ ∼10 ¹⁵ Ω⋅cm, which is much higher than that of ordinary mineral oil and synthetic hydrocarbon oil, and can effectively block current leakage. Dielectric constant: The dielectric constant is 2.6~2.8, and the dielectric loss tangent value is less than 1×10 ⁻⁴, indicating that it has extremely low energy loss under high-frequency electric fields and is suitable for high-speed electrical equipment.

Breakdown voltage: The breakdown voltage is greater than 10 kV/mm, which can withstand high electric field strength and meet the requirements of high-voltage equipment for insulating media.

2. Insulation stability under high temperature resistance

Thermal stability: The flash point of phenyl silicone oil is higher than 300℃, and it can maintain insulation performance for a long time in a high temperature environment of 200℃~300℃, while ordinary silicone oil is easy to decompose at high temperatures, resulting in insulation failure.

Oxidation inhibition: The introduction of phenyl groups significantly improves the antioxidant capacity of silicone oil. For example, after 1000 hours of continuous operation at 250℃, the acid value increase is only 0.1 mgKOH/g, ensuring the long-term stability of the insulation layer.

3. Adaptability under special working conditions

Radiation resistance: Silicone oil with high phenyl content (such as about 45%) has excellent radiation resistance and can be used for insulation protection in radiation environments such as nuclear power plant equipment and spacecraft.

Moisture and anti-fouling: Hydrophobic and moisture-proof properties can avoid the degradation of insulation performance caused by humidity, and its chemical inertness can prevent reactions with additives in insulating materials to ensure insulation reliability.

4. Comparative advantages with other insulating media

Compared with mineral oil: The volume resistivity of phenyl silicone oil is 2 to 3 orders of magnitude higher, and the insulation performance attenuation rate at high temperature is only 1/5 of that of mineral oil.

Compared with ordinary silicone oil: the introduction of phenyl groups increases its upper temperature resistance by 50℃~100℃ and significantly enhances its radiation resistance, making it suitable for more stringent electrical environments.