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Sealants and adhesives are important products that are widely used in production and life. They are widely used in the fields of construction, transport, electronic instruments and components, etc. Fumed silica is the preferred material for adhesive and sealant modification. Adding fumed silica to silicone sealants and adhesives can significantly increase the bonding strength and ensure free flow, prevent caking and hanging during curing, collapsing, denting, maintaining transparency, reinforcing, anti-shear and other roles. The mechanism is when it is dispersed in the sealant and adhesive, different particles through the surface of the silica hydroxyl hydrogen bonding, the formation of a silica aggregate network, so that the fluidity of the system is limited, viscosity increases, play a thickening effect; in the role of shear silica network is damaged, resulting in a decrease in system viscosity, thixotropic effect occurs, to facilitate the construction. Once the shear force is removed, this network structure can be re-formed, effectively preventing the adhesive from sagging during the curing process. The hydrophilic Geseesil A-200 fumed silica produced by Geseesil has good thickening thixotropic and anti-settling properties, and is widely used in adhesives and sealants, coatings and paints, silicone rubber, and unsaturated resins.