Highpurity silicon dioxide (SiO₂), commonly known as silica, is one of the most abundant oxides in the Earth’s crust and occurs in both crystalline and amorphous forms, including quartz, cristobalite, tridymite, and highpurity synthetic silica. Its exceptional thermal stability, dielectric strength, chemical purity, and optical transparency make it indispensable across advanced technology sectors.
Key Applications
- Semiconductors: Used in quartz tubes, rods, wafer carriers, dielectric layers, CMP slurries, and ultrapure crucibles for silicon crystal growth.
- Photovoltaics: Essential for monocrystalline silicon crucibles, highclarity solar glass, and encapsulation materials.
- Optics & Photonics: Supports optical glass, precision lenses, fiberoptic preforms, telecom fibers, and LED components.
- Advanced Ceramics & Coatings: Applied in hightemperature ceramics, composite substrates, thermal spray coatings, and RF/microwave dielectric materials.
- Medical Imaging & Sensors: Serves as a precursor for scintillation crystals and highpurity dielectric components.
- Specialty Chemicals & Metallurgy: Used in solgel chemistry, catalyst supports, pharmaceutical grade silica, and metallurgical additives.
General Properties
| Properties | Value |
| Chemical formula | SiO2 |
| CAS # | 7631-86-9 |
| EC / EINECS # | 231-545-4 |
| Molar mass | 60.08 g/mol |
| Appearance | White powder |
| Melting point | 1,713 °C (3,115 °F; 1,986 K) (amorphous) |
| Boiling point | 2,950 °C (5,340 °F; 3,220 K |
| Density | 2.648 (α-quartz), 2.196 (amorphous) g·cm |
| Solubility in water | Insoluble in water |
| Solubility | Under normal conditions, silicon does not react with most acids but is dissolved by hydrofluoric acid |
Product Availability
We provide high-purity Silicon dioxide (SiO2) tailored for semiconductor and other high-tech industrial requirements.
| Purity | 99.99% – 99.9999% |
| Forms | Powder |
| Particle Sizes | From -50 mesh to – 325 mesh |
| Nanoparticle Sizes | From 10 nm to 100nm |
| Package | At request |
If you are in need of any high purity Silicon dioxide (SiO2), please contact our sales team for details at sales@american-gmg.com.