Fumed silica is a high value-added fine chemical product; it is a white, loose, amorphous, non-toxic, non-polluting inorganic non-metallic oxide. The primary particle size betweens 7~40nm and the specific surface area is generally greater than 100m²/g. Because of its nano-effects, in the material the fumed silica exhibits excellent properties of reinforcing, thickening, thixotropic, insulation, matting, anti-sagging, which are widely used in the silicone rubber (polyester plastics, sealing materials,etc.), silicone glue (adhesives, paints, coatings, etc.) and high-performance fibers, new synthetic unsaturated resin, electric insulation, inks, pharmaceuticals, paper, food, cosmetics, chemical mechanical polishing, etc., to be known as the "industrial MSG".