Aerosil R 202 Fumed silica Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Epoxy (EP) Polysulfides PU - Prepolymers SEALANT ADHESIVE Aerosil R 202 fumed silica. Used in adhesives and sealants. Effect : anti-sag, thixotropy, anti-settling, reinforcement epoxy, polyurethane, vinylester adhesives and 1-K polyurethane sealants. Fumed silica. Used in epoxy, polyurethane and vinylester adhesives, and 1-K polyurethane sealants. Provides anti-sagging, thixotropic, anti-settling and reinforcement effects.