Fumed Silica
CAS No: 112945-52-5
Fumed Silica, or pyrogenic silica, is an ultrafine, amorphous silica produced by flame hydrolysis. It’s used as a thickening, anti-settling, and reinforcing agent in a range of formulations.
Synonyms
Pyrogenic Silica, Synthetic Amorphou Silica, Silicon Dioxide
Formula
SiO₂
CAS No
112945-52-5
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Properties
- Molecular weight: 60.08 g/mol
- Aggregation state: Powder
- Density: ~2.2 g/cm³ (true), ~30–50 g/L bulk
- Boiling point: Not applicable
- Melting point: ~1,710 °C
- Refractive index: ~1.46
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Key applications
- Thickener in paints and adhesives
- Free-flow agent
- Reinforcing filler in elastomers
- Anti-settling in coatings and resins
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Industries
- Coatings and Adhesives
- Rubber and Plastics
- Personal Care
- Pharmaceuticals
- Electronics
- Food Additives