Aerosil R 812 S Fumed silica Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Silicones (Si) ADHESIVE SEALANT Aerosil R 812 S fumed silica. Used in adhesives and sealants Effect : anti-sag, thixotropy, anti-settling, reinforcement. Improves transparency vinylester adhesives and 1-K silicone sealants. Fumed silica. Used in vinylester adhesives and 1-K silicone sealants. Provides anti-sagging, thixotropic, anti-settling effects and reinforcement. Improves transparency.