... Sealed fumed silica has size small, super specific surface area, high purity ,etc. It show superior properties, dispersion, reinforcing sex, ... for Silicone Rubber ,Adhesives, Sealants,Coatings, Paints and Inks,Rubber ,plastic,etc. Sealed fumed silica is a synthetic,amorphous,colloidal silicon ... unique in industry because of its unusual particle characteristics. white carbon black SiO2 silica sand