This work focused on using silica fume (by product) and quartz (industrial waste) in manufacture of ferrosilicon alloys in Egyptian chemical industries company (KIMA), in Aswan, Egypt. To reinforce the properties of Nitrile rubber, reduce cost and save the environment from industrial waste. Preparation rubber composites by addition different concentrations from silica fume filler (byproduct) and quartz filler (industrial waste). Investigation on the insulation properties of nitrile rubber composites by measurement of flashover voltage for unfilled nitrile rubber (blank) and nitrile rubber composites with silica fume filler and quartz filler. The measurement of flashover voltage for nitrile rubber composites occurred in different conditions (dry, wet, salinity and acidity). The effect of silica fume filler and quartz filler on mechanical properties of nitrile rubber was studied by investigation on elongation at break for nitrile rubber composites and also tensile strength. Studied the effect of hybrid filler on enhancement of electrical properties and mechanical properties of nitrile rubber, by addition different concentrations of mica filler on the samples showed the least enhancement in insulation properties of nitrile rubber composites in case of silica fume and quartz filler. And also study the morphology of nitrile rubber composites.