... area; 3.High purity 4.Surface chemical 5.hydrophobic Sealed fumed silica Sealed fumed silica has size small, super specific surface area, ... sex, thickening sex, thixotropy, electrical insulation, etc. Sealed fumed silica is mainly used for Silicone Rubber ,Adhesives, Sealants,Coatings, Paints ... unique in industry because of its unusual particle characteristics. hydrophobic silica gel H-200 SiO2