Fumed silica

Not to be confused with silica fume.
"Aerosil" redirects here. Not to be confused with aerosol.
Fumed silica with surface area of 130 m2/g

Fumed silica (CAS number 7631-86-9, also 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]

  1. ^ Flörke, Otto W.; Graetsch, Heribert A.; Brunk, Fred; Benda, Leopold; Paschen, Siegfried; Bergna, Horacio E.; Roberts, William O.; Welsh, William A.; Libanati, Cristian; Ettlinger, Manfred; Kerner, Dieter; Maier, Monika; Meon, Walter; Schmoll, Ralf; Gies, Hermann; Schiffmann, Dietmar (15 April 2008). "Silica". Ullmann's Encyclopedia of Industrial Chemistry: a23_583.pub3. doi:10.1002/14356007.a23_583.pub3. ISBN 978-3527306732.