Aerosil R 711 Fumed silica Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Acrylics/ Acrylates ADHESIVE Aerosil R 711 fumed silica. Used in adhesives Effect : anti-sag, thixotropy, anti-settling acrylate and methyl acrylate adhesives. Fumed silica. Used in acrylate and methyl acrylate adhesives. Provides anti-sagging, thixotropic and anti-settling effects.