The invention of silicone rubber coated fiberglass fabric has brought about many new conveniences. First of all, the material is able to function properly within the temperatures from -70 to 260 degrees. Second, it is resistant to ozone, oxygen, sunlight and aging. The product has a long using life of up to 10 years. Third, it is a good electric insulator. Compared to the ceramic items, the silicone rubber coated products are much lighter. The composite insulator has a bright future.