Performance Of Silicon-based Pre-insulated Bushings Under Extreme Temperature Conditions

The molecular structure of silicone rubber determines its excellent temperature resistance. The high bond energy of the silicon-oxygen backbone allows the material to maintain relatively stable mechanical strength within a working temperature range of 200°C to 300°C. The silicone rubber treated with a special formula can retain more than 66% at 1000°C. This means that in extreme scenarios such as fires, pre insulated sleeve can form a protective ceramic layer to prevent the spread of heat and harmful gases.

The application of pre insulated junction sleeve is particularly important at power cable joints. Traditional polyolefin materials leave only ash after high-temperature combustion, failing to maintain structural integrity and easily causing secondary short circuits. Silicone rubber insulated joint sleeve can undergo an organic-to-inorganic ceramic transformation under prolonged high temperatures, forming a self-supporting inorganic skeleton, which effectively extends the emergency protection time of the cable system.