![Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density and high surface area. Its three-dimensional structure results in viscosity-increasing, thixotropic behavior when used as a thickener or reinforcing filler.[1]](https://pakistan-cosmetics.com/wp-content/uploads/2024/05/aerosil-200-fumed-silica-pakistan-cosmetics.webp "aerosil-200-fumed-silica-pakistan cosmetics")
What is fumed silica?
Also known as pyrogenic silica, fumed silica is composed of amorphous SiO2. It is synthesised via the hydrolysis of silicon tetrachloride in an oxyhydrogen gas flame at high temperatures. As a result of this process, microscopic droplets consisting of amorphous silica fuse into chain-like 3D particles called secondary particles.
The particles then interact with the flame to create aggregates which join together reversibly, forming agglomerates. Aside from its thixotropic and anti-settling properties, AEROSIL® can also provide some reinforcement. This is immensely useful in the automotive and transportation industry as polyurethanes are often used as adhesives in windscreens.
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