High-voltage insulating silicone rubber serves as an indispensable "safety guardian" in power systems due to its superior insulation and weather resistance. In high-voltage transmission lines, silicone rubber insulators effectively block current leakage with high volume resistivity (exceeding 10¹⁵Ω·cm) and low dielectric loss (typically below 0.1%), ensuring efficient power transmission. For instance, in ±800kV UHVDC projects, silicone composite insulators maintain surface dryness in humid or foggy conditions via hydrophobicity (contact angle >120°), preventing pollution flashovers. Compared to traditional ceramic insulators, their pollution flashover voltage increases by over 30%, significantly reducing outage maintenance.

Moreover, silicone rubber’s aging resistance ensures stability in extreme climates. Its silicon-oxygen (Si-O) bonds (bond energy: 452kJ/mol) outperform carbon-carbon bonds (347kJ/mol), resisting UV, ozone, and high temperatures (long-term service up to 180℃). For example, after 5 years of field testing in desert substations, silicone cable terminals showed less than 5% degradation in mechanical and insulation properties, while conventional rubber materials cracked under the same conditions.

Silicone rubber also aligns with eco-friendly power development. Its combustion products—mainly silica and water—release no toxic gases and enable recycling. A company’s recycling process converts waste insulators into silicone oil and silica powder via pyrolysis, reusing them in production to close the resource loop and reduce lifecycle costs.

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