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In the electrical industry, the question “Are silicones good electrical insulators?” often arises among buyers and engineers. The answer is a definite YES. Silicone rubber is a high-performance insulating material, known for its excellent dielectric strength, high temperature resistance, and aging resistance. It is widely used in products such as composite insulators, insulating sleeves, and cable accessories in power systems.

silicons insulators

Due to its molecular structure containing Si–O bonds, silicone offers exceptional chemical stability and low polarity, effectively preventing electrical leakage and ensuring the safe operation of electrical equipment. It maintains high insulation resistance and low dielectric loss even under humid, polluted, or high-temperature conditions.

Industry Applications

  • Composite Insulators: Used in high-voltage transmission lines, offering lightweight, anti-pollution flashover, and UV-resistant properties.
  • Cable Accessories: Silicone is used in cable terminations and joints to enhance system safety.
  • Switchgear Components: Silicone sealing and insulating parts ensure long-term stable operation.
  • Substation Equipment: Silicone protective covers and insulating shields protect energized components.

Technical Specifications

Parameter Value/Description
Dielectric Strength (kV/mm) 20 – 25
Volume Resistivity (Ω·cm) ≥1×10¹⁴
Operating Temperature (℃) -50 ~ +200
UV Resistance Excellent
Water Absorption (%) ≤0.5
Dielectric Constant 2.8 – 3.3

Performance Features

Silicone insulation materials provide excellent electrical and mechanical performance, outstanding weather resistance, strong UV resistance, and low aging tendency. They have good flexibility to withstand impact and vibration, and offer resistance to acids, alkalis, and salt spray—making them ideal for coastal, high-pollution, and high-humidity environments.

Standards and Compliance

 

WishPower silicone insulation products are designed and manufactured in strict accordance with IEC 61109, IEC 62217, GB/T 19519, and other international and national standards. They undergo rigorous type tests and factory inspections to ensure safe operation in high-voltage transmission and industrial applications.

 

 

WishPower is a professional supplier of power system equipment. If you have procurement needs, please contact us to get a product quotation. Customization service is supported.

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