Silicon Dioxide
Silica
- CAS
- 7631-86-9
- EC
- 231-545-4
- Sectors
- Rubber & Elastomers, Coatings, Adhesives, Sealants & Elastomers, Plastics & Polymers
Silicon Dioxide (CAS 7631-86-9), also known as silica, is a white amorphous powder that occurs naturally or is produced synthetically, and it is used as a reinforcing filler in rubber and paints, as an anti-caking agent in food and as an adsorbent in cosmetics. Insoluble in water, high melting point 1710°C; occurs naturally or synthetically produced.
Typical Properties
| Molecular formula | O2Si |
|---|---|
| Molecular weight | 60.08 g/mol |
| Form | suspension |
| Color | White to yellow |
| Odor | at 100.00?%. odorless |
| Melting point | 1713 °C |
| Boiling point | 2230 °C |
| Density | 0.729 g/cm³ (solid) |
| Water solubility | insoluble |
| Flash point | 2230°C |
| pH | 5-8 (100g/l, H2O, 20°C)(slurry) |
| GHS signal word | Danger · Irritant / harmful, Health hazard |
| HS code | 2811221000 |
| Grades available | Technical Grade, Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Silicon Dioxide
Applications
Used as anti-caking agent in food, filler in pharmaceuticals, adsorbent in cosmetics, and in paints, rubber, and electronics for reinforcement; also in water filtration and chromatography.
Safety & Risks
May cause silicosis from chronic inhalation; irritates eyes and skin. California Prop 65 cancer warning; avoid dust formation. Stable but releases silicon oxides in fires; Hazard Class varies.
Packaging
In 25kg bags; store dry; dispose in sanitary landfills or incinerate with scrubbing.