... purity 4.Surface chemical 5.hydrophobic Yushuntong fumed silica Yushuntong fumed silica has size small, super specific surface area, ... thickening sex, thixotropy, electrical insulation, etc. Yushuntong fumed silica is mainly used for Silicone Rubber ,Adhesives, Sealants,Coatings, ... Paints and Inks,Rubber ,plastic,etc. Yushuntong fumed silica is a synthetic,amorphous,colloidal silicon dioxide that is ...