Fumed silica
Silicon dioxide with branched chains on micro scale / From Wikipedia, the free encyclopedia
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Not to be confused with silica fume.
"Aerosil" redirects here. Not to be confused with aerosol.
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]