Abstract
In almost all new-builds, replacement and upgrades, silicone rubber (SiR) material was an attractive alternative compared to traditional ceramic based insulators. This paper showcases the experimental findings to understand the physical properties of silicone rubber filled with various mineral fillers of calcium carbonate, silica and wallostonite minerals (CaCO3, SiO2 and CaSiO3) for high voltage insulator applications. The physical attributes have been analysed through the hardness and water absorption testing. An addition of mineral fillers into pure silicone rubber at different weight percentages of 5, 10, 20, 30 and 40 wt% had caused a significant improvement of hardness values which was clearly dominated by SiR/CaSiO3 composite samples of wallostonite mineral addition. In addition, in terms of water absorption, the stable water absorption behavior has again possessed by the SiR/CaSiO3 composite samples. Wallostonite mineral has responsible to improve SiR rubber physical properties due to their nature of hydrophobic and sharp edges morphologies, which advantages for hardness and water resistance. Hence, from these studies, it can be concluded that, the best performance of SiR based composites was clearly made known by SiR/CaSiO3 for both testings.
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