Silicone insulating coating ensures the safe operation of equipment through multiple protection mechanisms in high-voltage electrical appliances. The specific functions are as follows:
1. Core safety protection role
‌High-voltage electrical insulation‌
Silicone coating has excellent dielectric strength and high insulation resistance value, which can effectively isolate high-voltage current and prevent equipment short circuit and leakage accidents9. Its stable dielectric performance can still maintain reliable insulation under complex working conditions, and is suitable for key parts such as high-voltage cable joints and transformers.

‌High temperature tolerance protection‌
The heat-resistant temperature can reach 180–250℃ (pure silicone) or above 300℃ (modified formula). When the electrical appliance is overloaded or short-circuited to cause high temperature, the coating can maintain structural stability and avoid insulation failure. At the same time, it has cold resistance (-50℃ to -80℃) and adapts to extreme temperature difference environments.

‌Environmental erosion protection‌
‌Moisture-proof and anti-fouling‌: The hydrophobic property blocks moisture penetration and prevents discharge creepage caused by humid environment; the smooth surface reduces dirt adhesion and reduces the risk of flashover (such as the application case of substation switch cabinet).
‌Chemical corrosion resistance‌: Resistant to corrosion by acids, alkalis, salts and other media, protecting the metal matrix from corrosion damage.

2. Additional safety features
‌Flame retardant and fireproof‌: Some formulas contain self-extinguishing properties, which inhibit the spread of flames when encountering fire, buying time for emergency repairs1.
‌Seismic buffering‌: The flexibility of the silicone resin coating can buffer mechanical vibrations and prevent internal components from loosening due to vibration and causing arc discharge.
‌Sealing and anti-seepage‌: When used in cable joints and other parts, it forms a dense sealing layer to prevent moisture and pollutants from invading.

Through the above-mentioned comprehensive protection mechanism, silicone insulating coatings have become key materials for high-voltage electrical appliances to resist electrical failures, environmental erosion and accidental damage, providing multiple safety guarantees for the stable operation of power systems.