New potential High Voltage Direct Current (HVDC) cable insulation materials based on nanocomposites are developed in this study. The produced by blending of polypropylene (PP), propylene-ethylene copolymer (PP–HI) and a modified fumed silica (A-silica) concentration 1 2 wt %. A-silica is successfully with (3-aminopropyl)triethoxysilane (APTES) via solvent-free method, as proven infrared spectro...