... called microsilica, silicon ash, condensed or densified silica fume, its color is grey. Silica fume is also called microsilica, silicon ash, condensed ... strength, ect. It can improve the inner quality of the building, and widely used in the construction of bridges, water ... on 45umMax. 0.5%Bulk density< 700 kg/m3Silica fume can be supplied as your reuirements. Silica fume for concrete and refractory