Silicone rubber (SiR) insulator has been used for outdoor applications for more than 30 years due to its excellent properties such as hydrophobicity, UV stability, flexibility, and lower cost. To increase their performance and to reduce the unit cost, the application of filler is required. The application of micro or nanofillers such as silica (SiO_2), aluminum oxide (Al_2O_3), and a carbon black to a polymer insulator has proven to increase the performance of a SiR. However, their prices are relatively still higher due to their cost production.
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