... to 650 kg/m3 Microsilica , Micro Silica , Silicafume , Dioxide , Silicon Dioxide 85%-97% Micro silica ,also called silica fume or micro silica, is a byproduct of production ... has extremely strong surface active.Features Characteristics1).Appearance is as grey&white off.2).High electrical resistivity3).Low Permeability4).Superior resistance ...