Difference between revisions of "Fumed silica"
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== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | + | * CAS = 112945-52-5 | |
| − | + | * Composition = SiO2 | |
| − | + | * Density = 2.0 - 2.2 g/cm3 | |
| − | + | * Melting point = 1700 C | |
| − | + | * Decomposition = >2000C | |
| + | * Moisture content = 0.5-2.5 % (Hydrophilic); 0.5% (hydrophobic) | ||
| + | * Adsorbed moisutre = 6% | ||
| + | * Refractive index = 1.46 | ||
| + | * Particle size = 5-40 nm | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 10:03, 5 August 2023
Description
A colloidal form of silica that is a very light, fluffy white powder. Fumed silica, also called aerosol silica, is made by hydrogen-oxygen furnace combustion of silicon tetrachloride. This produces tiny spherical particles of varying sizes. Fumed silica is available in hydrophilic and hydrophobic (coated) forms. It is used as a matting agent, thickener, and filler in many adhesives and coatings. Fumed silica has also been used as a desiccating agent to kill insects.
Synonyms and Related Terms
aerosol silica; colloidal silica; pyrogenic silica; thermal silica; Aerosil® [Degussa-Huls]; Cab-O-Sil [Cabot]
Applications
Risks
- Inhalation may cause silicosis; used dust mask.
- Integra Chem: SDS
Physical and Chemical Properties
- CAS = 112945-52-5
- Composition = SiO2
- Density = 2.0 - 2.2 g/cm3
- Melting point = 1700 C
- Decomposition = >2000C
- Moisture content = 0.5-2.5 % (Hydrophilic); 0.5% (hydrophobic)
- Adsorbed moisutre = 6%
- Refractive index = 1.46
- Particle size = 5-40 nm