Colloidal Silicon Dioxide
USP/EP and food-grade Colloidal Silicon Dioxide (fumed silica, E551, CAS 7631-86-9) supplied wholesale by Zyntex. Glidant for tablets and capsules, anti-caking agent for food and thickener for cosmetics and coatings. CoA and SDS.
Description
Colloidal Silicon Dioxide Product Overview
Colloidal silicon dioxide (SiO2) is an extremely light, fluffy, bluish-white amorphous powder with a very large surface area, typically 175–225 m²/g for pharmaceutical grades. Because its particles are so small, tiny amounts strongly improve the flow of powders.
In addition, pharmaceutical companies add it at about 0.1–1% as a glidant in tablet and capsule blends, and as a moisture adsorbent. Similarly, food producers use it (E551) as an anti-caking agent in salt, spices and powdered products, cosmetic formulators use it as a thickener and mattifying agent, and coating and adhesive producers use it to control rheology.
Notably, hydrophilic grades suit most uses, whereas hydrophobic grades serve special technical applications. Related excipients in our range include Magnesium Stearate, Talc and Microcrystalline Cellulose (MCC).
Key Applications of Colloidal Silicon Dioxide
Typical uses include, for example:
💊 Glidant
Improves powder flow at 0.1–1%.
🧂 Anti-Caking
Food additive E551.
🧴 Cosmetics
Thickener and mattifier.
🎨 Coatings
Rheology control.
Colloidal Silicon Dioxide Technical Specifications
| Parameter | Standard Value |
|---|---|
| Product Name | Colloidal Silicon Dioxide (Colloidal Anhydrous Silica) |
| CAS Number | 7631-86-9 |
| E Number | E551 |
| Specific Surface Area | Approx. 175 – 225 m²/g (pharma grade) |
| Grades | USP/EP, food and technical |
| Appearance | Light, bluish-white amorphous powder |
| Documents | CoA and SDS with every lot |
⚠️ Safety & Handling: Not classified as hazardous under GHS, but the very fine dust may irritate the respiratory tract. Avoid dust formation and also wear dust protection. Store in tightly closed bags in a dry place. Always consult the Safety Data Sheet (SDS), because it contains the full classification and handling instructions.
Frequently Asked Questions
How much colloidal silica is used in tablets?
Typically 0.1–1% as a glidant.
Is it crystalline silica?
No. It is amorphous silica, which is a different material from crystalline quartz.
How can I get a price and documents?
We supply flexible quantities, from small orders to large volumes, so you do not need to meet the high minimum orders of large producers. Please contact us with your required volume, and we will send a quotation together with the CoA and SDS.
