Fumed Silica

Fumed silica is an amorphous, nano-scale powdered material. Fumed silica particles are produced by injecting silicon tetrachloride or other types of chlorosilanes with air and hydrogen flames. Fumed silica has a medium specific surface area, high purity, and an aggregated structure with submicron particle sizes. These characteristics give it low bulk density and a hydrophilic surface. For this reason, fumed silica is suitable for various applications. It is widely used in RTV silicone sealants, HTV silicone rubber, paints, coatings, inks, and pigments. Additionally, it is utilized in unsaturated polyester resins, adhesives, sealants, thermal insulation materials, and vacuum insulation panels. Fumed silica is also applied in composites, PVC, and storage batteries.

In terms of functionality, fumed silica can influence the flow and viscosity of liquids, adhesives, and polymers, controlling thickening and flow properties. It acts as an anti-settling, thickening, and anti-sagging agent, helping to improve free flow and suspension in powders. Additionally, it reinforces silicone rubber and functions as an effective adsorbent.