Room temperature vulcanized silicone rubber (RTV-SiR) materials are broadly employed for high voltage outdoor insulation applications. Like other polymeric materials, such insulators degrade due to the multiple stresses caused by the environment. Therefore, for the investigation of multiple stresses presented in the environment such as UV radiations, salt fog, acid rain, heat, humidity, etc., a neat SiR, two aluminum trihydrate (ATH) filled composites of SiR (SMC1 and SMC2), one silica filled composite SiR (SMC3), and a co-filled composite (SMNC) having ATH and silica as fillers are fabricated and tested for 9000 h. After aging, the sample SMC3 and neat SiR show better hydrophobic behavior than the other samples. All the samples offer better leakage current suppression throughout aging. Dielectric breakdown strength (DBS) of SMC2 and SMC1 is measured better than their counterparts. Volume and surface resistivities of SMC1 remain the highest followed by SMC2 and SMC3. Scanning electron microscopy (SEM) results suggest that the surface of SMC2 retains excellent surface condition followed by neat SiR. SMC1, SMC2, and SMNC absorb higher water relatively after 24 h of immersion test whilst SMC1 and SMC3 exhibit a similar tendency after 2-h boiling test.

室温硫化硅橡胶（RTV-SiR）材料广泛用于高压户外绝缘应用。像其他聚合物材料一样，这种绝缘体由于环境造成的多重应力而退化。因此，为了研究环境中出现的多种应力，例如紫外线辐射，盐雾，酸雨，热，湿度等，使用了纯净的SiR，两种三水合铝（ATH）填充的SiR复合材料（SMC1和SMC2），制造了一种二氧化硅填充的复合材料SiR（SMC3），以及以ATH和二氧化硅为填充剂的共填充复合材料（SMNC），并进行了9000小时的测试。老化后，样品SMC3和纯SiR表现出比其他样品更好的疏水性。所有样品在整个老化过程中都能提供更好的漏电流抑制能力。SMC2和SMC1的介电击穿强度（DBS）的测量要好于它们的对应物。SMC1的体积和表面电阻率保持最高，其次是SMC2和SMC3。扫描电子显微镜（SEM）结果表明，SMC2的表面保留了优良的表面条件，随后是纯净的SiR。浸泡测试24小时后，SMC1，SMC2和SMNC会吸收相对较高的水分，而沸腾2小时后，SMC1，SMC3表现出相似的趋势。