Analysis Of The Role Of Silicon-based Residues After Thermal Decomposition In Cold-shrink Cable Accessories

Silicone rubber, as a raw material for Cold Shrink Cable Accessories, undergoes chemical decomposition at high temperatures, losing its organic side chains to form inorganic structural residues mainly composed of silicon dioxide. During thermal decomposition, silicone rubber transforms into a silica framework structure closer to a glassy state; this solid residue possesses a high melting point and chemical inertness.

The silicone rubber formulation used in cold-shrink cable accessories includes organic groups such as methyl and phenyl groups. These groups break down first under combustion or high-temperature oxidation conditions, volatilizing the organic components. The remaining siloxane chains polymerize into amorphous silica-like substances. Silicone rubber materials do not produce large amounts of toxic fumes during combustion tests; the final residue is primarily powdery or solid silica. This residue formation mechanism is widely used to evaluate the flame performance and safety level of insulation materials.