Polymer Insulators for High Voltage Applications : LAP Lambert Academic Publishing : 9786205498125 : 620549812X : 22 Sep 2022 : Nano composite elastomeric insulator for high voltage applications (11kV) composed of silicon rubber (type 630 RTV) and Nano silica particles (25-43 nm) was manufactured. Five ratios of Nano silica (1,2,3,3.5 and 4 pphr) were employed and compared with the control sample (pure silicon rubber). DSC, FTIR, EDX and SEM tests were carried out which showed that there are chemical interactions between the Nano filler and the silicon rubber matrix. Breakdown strength measurements proved that silicone rubber alone is unsuitable for employed as an electrical insulator for 11kV, unless reinforced with Nano silica. Other dielectric results, showed that the 4pphr loading level possess worst properties rather than mixing difficulties, while the 2pphr loading level has better properties(higher resistivity, dielectric strength and dielectric constant lower dielectricloss).We