The dielectric strength of silicone rubber insulation materials typically ranges from 15 to 25 kV/mm, making it a highly efficient electrical insulator. The dielectric strength depends on several factors:
Material composition: Pure silicone rubber has superior dielectric properties, but adding fillers (such as silica) may enhance mechanical strength or slightly reduce dielectric strength.
Thickness effect: Thinner layers generally exhibit higher dielectric strength, but a balance must be struck between mechanical protection and insulation requirements in practical applications.
Environmental conditions: High temperatures or high-frequency electric fields may degrade performance, but silicone rubber remains stable in the range of -50 to 200°C, superior to many organic rubbers. Silicone rubber's advantages also include excellent weather resistance, UV resistance, and chemical corrosion resistance, making it suitable for outdoor high-voltage insulators, medical equipment conductors, and new energy vehicle components. For example, in high-voltage cables, silicone rubber insulation layers effectively prevent partial discharge and extend service life.
Furthermore, its flexibility allows for complex shape encapsulation, while its non-toxic properties meet medical and food-grade standards. In summary, silicone rubber, with its balanced dielectric and physical properties, has become an irreplaceable insulating material in modern industry, especially suitable for fields with stringent requirements for reliability and environmental adaptability.
