AEROSIL R 974 is a hydrophobic fumed silica aftertreated with DDS (Dimethyldichlorosilane) based on a hydrophilic fumed silica with a specific surface area of 200 m2/g. AEROSIL R 974 improves hydrophobicity and rheology. It provides anti-settling properties, pigment stabilization and improves corrosion protection. Due to its large surface area, AEROSIL R 974 provides improved thickening and thixotropic effect as well as transparency. It also maintains free flow and anti-caking characteristics of powders.