Product Details
| Product Name: Silicon dioxide | CAS No.: 7631-86-9 |
| EC-No.: 231-545-4 | Min. Order: 1kg |
| Purity: 99.2% | Supply Ability: 1000kg |
| Release date: 2025/11/29 |
Silicon dioxide (chemical formula: SiO₂), commonly known as silica, is an oxide of silicon. Here's a concise overview:
Key Chemical Properties
Structure:
Crystalline forms (e.g., quartz, tridymite, cristobalite) with tetrahedral SiO₄ units.
Amorphous forms (e.g., glass, diatomaceous earth).
Physical Traits:
Hard, brittle solid (Mohs hardness: 7 for quartz).
High melting point (∼1,700°C), chemically inert, insoluble in water/acid (except HF).
Excellent electrical insulator and UV-transparent.
Natural Occurrence
Abundant in nature: Quartz (rocks, sand), flint, agate, and biogenic sources (diatom skeletons).
Major Applications
| Field | Use |
|---|---|
| Glass/Ceramics | Primary raw material (∼70% of glass). |
| Semiconductors | Critical in silicon wafer production. |
| Food/Pharma | Anti-caking agent (E551), tablet binder. |
| Construction | Sand for concrete; silica fume additive. |
| Cosmetics | Absorbent (e.g., toothpaste abrasives). |
⚠️ Safety
Non-toxic but crystalline silica dust (e.g., quartz) is carcinogenic when inhaled.
Amorphous silica (e.g., food-grade) is generally safe.
Summary: Silicon dioxide’s versatility—from geological stability to industrial utility—stems from its structural diversity and inertness, underpinning technologies from microchips to skyscrapers.



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- Since: 2006-04-03
- Address: Room 2015, No.2 Building Kaixin Mansion, No.107 Jinqiao Ave, Wuhan, China
+8613986145403
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