DUST^TM Silica Fume is a supplementary cementitious material, comprising of amorphous silica produced by electric arc furnaces as a byproduct of the production of elemental silicon or ferro silicon alloys and selected additives. DUST^TM Silica Fume can be used in a variety of applications, such as concrete, mortars, grouts and fiber cement products. DUST^TM Silica Fume(Micro silica) complies with the provisions and specifications of ASTM C1240 and EN 12363-1,2.