This research reports on leakage currents and flashovers on silicone rubber treated with coal dust (fly ash) pollutants with variations in the duration of impurity conditioning, namely 1; 2; 3 days and no conditioning. This study prepared for testing the RTV 497 silicone rubber test sample which was formed in a sheet with a thickness of 1 mm while the heish and width were 50 x 25 mm which were …