Buy Silicon Dioxide Food Additive
Silicon Dioxide Food Additive (E551)
Silicon dioxide, commonly known as silica, is an inorganic compound with the formula SiO₂ that exists as a fine, white powder. In food processing it functions primarily as an anti‑caking agent by absorbing surface moisture and preventing particle agglomeration in hygroscopic powders.
The effectiveness of silica depends on its particle size distribution and surface area; grades with a median diameter between 5 µm and 20 µm provide optimal flow improvement without significantly affecting product density or mouthfeel.
Technical Specifications
| Property | Typical Value | Test Method |
|---|---|---|
| Appearance | Free‑flowing white powder | Visual inspection |
| Particle Size (D50) | 10 µm ± 3 µm | Laser diffraction |
| SiO₂ Content | ≥ 99.0 % | XRF |
| Loss on Drying (105 °C, 2 h) | ≤ 0.5 % | Thermo‑gravimetric |
| pH (10 % slurry) | 5.0 – 8.0 | Potentiometric |
| Bulk Density | 40 – 60 g/L | ASTM B329 |
Function in Food Applications
When added to powders such as spices, milk powders, or baking mixes, silica particles adsorb moisture at the particle surface, reducing inter‑particle forces that cause caking. This maintains free‑flowing properties during storage, handling, and high‑speed dispensing.
Because silica is chemically inert and does not react with food ingredients, it does not alter flavor, color, or nutritional value, making it suitable for a wide range of pH and temperature conditions.
Typical Applications
- Spice blends and seasoning powders – prevents clumping in humid environments.
- Powdered dairy and coffee creamers – maintains flow in vending machines and bulk containers.
- Baking powders and cake mixes – ensures uniform dispersion of leavening agents.
- Instant soups and sauce mixes – avoids lump formation during reconstitution.
Quality Assurance & Compliance
Each batch undergoes rigorous testing for purity, heavy metal content (lead, arsenic, cadmium, mercury) and microbiological limits according to FCC, EU Regulation 231/2012 and FDA GRAS standards. Certificates of Analysis are provided with every shipment.
Manufacturing follows ISO 9001 quality management principles, and the product is produced in a dedicated food‑grade facility to avoid cross‑contamination.
Packaging & Storage
Silicon dioxide is supplied in multi‑layer polyethylene/polypropylene bags with an inner moisture‑barrier liner, typically 25 kg net weight. Bags are sealed and placed on pallets with stretch film for transport stability.
Store in a cool, dry area away from direct sunlight; recommended storage temperature is 10 °C – 30 °C with relative humidity below 60 % to preserve flow properties.
Ordering Information
Minimum order quantity is one pallet (40 bags). Standard lead time is 2‑3 weeks for stocked grades; customized particle size or surface treatment may extend lead time to 4‑5 weeks. Samples (up to 500 g) are available upon request for evaluation.
Frequently Asked Questions
- Can the particle size be adjusted for specific applications? Yes, we offer grades ranging from 2 µm to 30 µm D50; please specify the required range when requesting a quotation.
- What information is needed for a quote? Required details include desired grade (purity, particle size), quantity, packaging preference, delivery destination, and any required certifications (e.g., Kosher, Halal).
- Is the product compliant with organic standards? Silicon dioxide is permitted as a processing aid in many organic regulations; verification against the specific certifying body’s list is recommended.
- How is quality verified before shipment? Each lot is accompanied by a Certificate of Analysis showing assay, loss on drying, heavy metal limits, and microbiological results; third‑party testing can be arranged if needed.
Contact for Inquiry
For technical data, samples, or a formal quotation, please reach out to our sales team.