Aerosil 150 Silicium dioxide 112 945-52-5 Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Rubber - Elastomer (Chloroprene, Butyl …) Silicones (Si) SEALANT Aerosil 150 is a hydrophilic fumed silica. Used in sealants and silicone sealants. Improves reinforcement and thixotropy in room temperature vulcanizing silicone sealants.Improves reinforcing properties in HCR-silicone rubber Hydrophilic fumed silica. Has a reinforcement and thixotropic behaviour in room temperature vulcanizing silicone sealants.