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[Degussa-Huls] A registered trademark for an ultra-fine powdered silica. Aerosil® is a colloidal form of silica that is a very light and fluffy powder. It is made by burning silicon tetrachloride in a hydrogen-oxygen furnace. This produces spherical particles; the particle size can be controlled and varying grades are available ranging in size from 4 to 25 micrometers. The fine particle size provides a high surface area. Aerosil® particles can absorb up to 40% of their own weight and still perform as a powder. It is used as a filler, thickener, and as a matting agent in paints.

Synonyms and Related Terms

aerosol silica; amorphous fumed silica; hydrophilic sillica

Other Properties

pH = 3.6-4.5

CAS 112945-52-5
Melting Point 1700
Density about 2.2
Refractive Index 1.45

Hazards and Safety

Inhalation may cause silicosis; use dust mask. Particles can irritate eyes.

Non-flammable. Inert.

Degussa: MSDS

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 709
  • Ceramics and Glass Conservation Section, List of Workshop Materials, The British Museum, London
  • MSDS Sheet Comment: at MFA: old CAS# = 68611-44-9
  • Product Information Comment: Degussa AG product brochure
  • Website address 1 Comment: