Silica-Based Rheology Control Additive Hydrophilic Fumed Silica 300 1, General Description Silica-Based Rheology Control Additive 300 is a hydrophilic fumed silica with a specific surface area of 300 m2/g. It provides a very strong rheological effect Silica-based r controladditi Silica-based rheologycontroladditiv 2, Chemical Composition: SiO2 content >99.8 % 3, Sale Specification & Typical Properties: Quality Unit Range losson drying % 99.8 specific surfacearea(BET) m²/g 270