Silicon Dioxide (Food Grade Anti-Caking Agent)
CAS Number: 7631-86-9
Food-grade amorphous silicon dioxide (E551) is a highly porous, synthetic silica used as an anti-caking agent in powdered foods, spice blends, salt, and dry mixes. With an extremely high surface area (100–400 m²/g), it adsorbs moisture and free fatty acids on powder surfaces, maintaining flowability during processing and storage. Effective at low concentrations (0.1–1.0%) and tasteless, odorless, and chemically inert.
Technical Specifications
| appearance | White amorphous powder |
| moisture (%) | ≤7.0 |
| heavy metals (ppm) | ≤30 |
| BET surface area (m²/g) | 100–400 |
| SiO2 content (dry basis, %) | ≥99.0 |
Applications
- Table salt and seasoning salt anti-caking
- Spice blends and herb powder flowability improvement
- Grated cheese and dairy powder anti-caking
- Coffee creamer and beverage powder free-flow
- Pharmaceutical tablet filler and anti-caking agent
Key Features
- Extremely high surface area provides superior moisture adsorption capacity
- Effective at very low usage levels (0.1–1.0%), minimal impact on nutrition label
- Chemically inert and tasteless, no impact on product flavor or color
- EU E551 approved, GRAS status, FCC grade available
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CAS Number
7631-86-9
Category
Food / Beverage AdditivesAvailability
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