Introduction
Silicon Dioxide (SiO₂), commonly known as silica, is one of the most abundant minerals on Earth. In its food-grade and pharmaceutical-grade forms, it is produced as an amorphous (non-crystalline) white powder through either fumed (gas-phase) hydrolysis or wet precipitation processes. Only amorphous silicon dioxide is permitted for food and pharmaceutical applications; crystalline silica (quartz) is not food-grade.
Silicon dioxide is primarily used as an anti-caking agent and free-flow agent in powdered products. Its micro-particles coat powder surfaces, absorb ambient moisture, and prevent ingredients from sticking together or forming lumps. Beyond its anti-caking function, silicon dioxide serves as a stabilizer, clarifier, carrier for flavors and active ingredients, and moisture/oil scavenger.
As a pharmaceutical excipient, colloidal silicon dioxide is widely used as a glidant to improve powder flowability in tablet compression and encapsulation processes. It is also approved for use in cosmetics as a thickening, emulsion-stabilizing, and absorbing agent.
Our Silicon Dioxide Powder is manufactured under strict quality control standards, ensuring consistent purity, particle size distribution, and performance across every batch.
Product Forms & Specifications
| Attribute | Food Grade | Pharma Grade (Excipient) |
|---|---|---|
| Purity (SiO₂) | ≥96% – ≥98% | ≥99% |
| Appearance | White, fine powder | White, fine powder |
| Loss on Drying | ≤5.0% – 8.0% | ≤5.0% |
| Loss on Ignition | ≤7.0% – 8.5% | ≤7.0% |
| BET Surface Area | 170–240 m²/g | 200 ± 25 m²/g |
| pH (10% suspension) | 5.0–8.0 | 5.0–8.0 |
| Oil Absorption | 2.0–3.0 cm³/g | 2.0–3.0 cm³/g |
| Heavy Metals | As ≤3; Pb ≤5; Cd ≤1; Hg ≤1 mg/kg | As ≤2; Pb ≤5; Cd ≤1; Hg ≤1 mg/kg |
| Total Plate Count | ≤500 cfu/g | ≤500 cfu/g |
| Primary Function | Anti-caking, free-flow, carrier, stabilizer | Glidant, anti-adherent, suspending agent |
| Regulatory Status | GRAS (FDA); E551 (EFSA) | FDA inactive ingredient; EXCiPACT |
| Max Usage Level | ≤2% of finished food (FDA); ≤1% in powders (EU) | 0.1%–0.5% in tablets |
Silicon Dioxide Benefits
Functional Benefits
- Anti-Caking & Free-Flow: Prevents clumping and maintains free-flowing properties of powdered products, ensuring consistent dosing and consumer satisfaction.
- Moisture & Oil Scavenging: Extends shelf life by locking up excess humidity and fats.
- Stabilization & Clarification: In beverages such as beer, wine, and juices, silica removes haze-forming proteins.
- Carrier Function: Helps evenly disperse micro-dosed flavors, spices, and active ingredients.
- Flow Enhancement (Pharma): Improves powder flowability and reduces tablet weight variation in pharmaceutical manufacturing.
- Texture Modification (Cosmetics): Acts as a thickening, emulsion-stabilizing, and absorbing agent; modulates formula texture and limits perceived oily phase.
Nutritional Benefits (as Dietary Supplement)
- Bone Health Support: Silicon supplementation has been associated with increased bone mineral density and improved bone strength.
- Skin, Hair, and Nail Health: Early research suggests silicon dioxide may improve skin elasticity, hair quality, and nail health.
- Connective Tissue Support: Silicon plays a role in collagen synthesis and connective tissue integrity.
- Antioxidant Properties: Silicon-based agents have demonstrated anti-inflammatory, anti-apoptotic, and antioxidant effects.
What is Silicon Dioxide Used For?
Food & Beverage
- Anti-Caking Agent: Protein powders, spices, baking mixes, table salt, sugar, and powdered milk products
- Stabilizer & Clarifier: Beer, wine, fruit juices
- Carrier: Flavors, spices, and active ingredient dispersion
- Moisture Scavenger: Shelf life extension in powdered and granular products
Dietary Supplements
- Anti-Caking Agent: Capsules, tablets, and powder blends to maintain free-flowing properties
- Silicon Supplement: Orthosilicic acid and other bioavailable silicon forms for bone, skin, hair, and nail health
Pharmaceuticals
- Glidant: Improves powder flowability in tablet compression and encapsulation
- Anti-Adherent: Prevents sticking of powder to tablet punches and dies
- Suspending Agent & Emulsion Stabilizer: Topical and liquid pharmaceutical formulations
- Excipient Carrier: Co-processed excipients for controlled drug release
Cosmetics & Personal Care
- Thickening & Emulsion Stabilizing: Creams, lotions, sunscreens
- Texture Modification: Limits perceived oily phase; enhances sensory feel
- Light-Diffusing Properties: Powders and makeup formulations
- Abrasive: Toothpaste and exfoliating products
Industrial Applications
- Desiccant: Moisture absorption in packaging
- Filler: Silicone elastomers, paints, coatings, adhesive
Frequently Asked Questions (FAQ)
Q: What is the difference between food-grade and pharmaceutical-grade silicon dioxide?
A: Food-grade silicon dioxide is used as an anti-caking agent and carrier in food products, with purity typically ≥96% and specific heavy metal limits. Pharmaceutical-grade (colloidal silicon dioxide) is a higher-purity excipient (≥99%) used as a glidant, anti-adherent, and suspending agent in tablet and capsule manufacturing. Both are amorphous (non-crystalline) forms.
Q: Is silicon dioxide safe for consumption?
A: Yes. The U.S. FDA recognizes amorphous silicon dioxide as GRAS (Generally Recognized as Safe). EFSA has reaffirmed that silicon dioxide (E551) does not raise a safety concern in all population groups at reported use levels. Maximum usage levels: ≤2% of finished food (FDA) and ≤1% in most powdered products (EU).
Q: What is the recommended dosage for silicon dioxide as a dietary supplement?
A: Silicon dioxide dosage varies by supplement form. Typical supplement capsules and tablets contain between 1 mg and 10 mg of silicon dioxide per dose as an excipient. For silicon supplementation (as orthosilicic acid), follow product-specific labeling. The Safe Upper Level for total daily silicon intake is estimated at 760 mg per day (at 60 kg body weight).
Q: Is silicon dioxide soluble in water?
A: No. Silicon dioxide is insoluble in water. Its anti-caking function relies on its ability to absorb moisture and coat particle surfaces rather than dissolving.
Q: Is crystalline silica the same as food-grade silicon dioxide?
A: No. Crystalline silica (quartz) is not permitted for food or pharmaceutical use. Only amorphous (non-crystalline) silicon dioxide is approved as a food additive and pharmaceutical excipient. Crystalline silica inhalation poses health risks such as silicosis, but dietary exposure to amorphous silica is not associated with this risk.
Why Choose Huilin Bio-Tech?
Your Professional Manufacturing & Sourcing Partner
We are more than a supplier - we are a comprehensive supply chain partner dedicated to high-quality ingredients, custom formulations, and finished products across multiple industries.
Professional Manufacturer: Xi'an Huilin Bio-tech Co., Ltd. is a high-tech biotechnology company specializing in the production, R&D, and export of natural botanical extracts.
Quality Assurance: Every batch undergoes rigorous testing for capsaicin content (HPLC), heavy metals (ICP-MS), and microbiological purity to ensure consistent quality and safety.
Flexible Specifications: We offer a wide range of specifications from 1% to 98% capsaicin content to meet diverse application requirements.
Customization Capabilities: We offer flexible packaging options and custom formulations to meet diverse customer requirements.
Supply Chain Reliability: With established supply chains and robust production capacity, we ensure timely delivery and stable supply for bulk orders.
Technical Support: Our experienced R&D team provides formulation guidance and technical support throughout your product development process.
Global Compliance: Products are manufactured in compliance with international quality standards and regulatory requirements.
For inquiries, quotations, or sample requests, please contact: sales@huilinbio-tech.com
References
1. EFSA Panel on Food Additives and Flavourings (FAF). Re-evaluation of silicon dioxide (E 551) as a food additive in foods for infants below 16 weeks of age and follow-up of its re-evaluation as a food additive for uses in foods for all population groups. EFSA Journal. 2024;22(10):e8880. doi:10.2903/j.efsa.2024.8880. The Panel concluded that E 551 does not raise a safety concern in all population groups at the reported uses and use levels.
Link: https://pubmed.ncbi.nlm.nih.gov/39421729/
2. Silicon Supplementation for Bone Health: An Umbrella Review Attempting to Translate from Animals to Humans. PMC. 2024. The direct effects on bone cells and collagen synthesis could assist in cartilage repair and bone strength and demonstrate the importance of Si within the diet. By altering both mineral metabolism and collagen synthesis, Si supplementation may increase bone density and strength.
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10857027/
3. Diverse Possibilities of Si-Based Agent, a Unique New Antioxidant. PMC. 2023. Si-based agents are expected to be highly effective therapeutic drug candidates because they have anti-inflammatory, anti-apoptotic, and antioxidant effects.
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10215636/
4. A Systematic Review on the Hazard Assessment of Amorphous Silica Based on the Literature From 2013 to 2018. PMC. 2022. Overall, the in vitro and in vivo data showed low or no toxicity of amorphous silica.
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC9240267/
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