Aerosil 90 Silicium dioxide 112 945-52-5 Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Rubber - Elastomer (Chloroprene, Butyl …) Silicones (Si) SEALANT Aerosil 90 is a hydrophilic fumed silica. Used in sealants. Small surface area. Has a reinforcement and thixotropic behaviour. Particularly suitable for achieving highloading levels or improving extrudability Hydrophilic fumed silica. Used in sealants. Has a reinforcement and thixotropic behaviour.