Selenium dioxide (SeO₂), also known as selenium(IV)oxide or selenous anhydride, is an oxide of selenium that appears as a white powder or colorless crystalline solid. With slight decomposition, the material may take on a faint pink tint.
SeO₂ is used in several industrial and chemical processes. It plays an important role in manganese production and surface treatment, where it functions as a catalyst or formulation ingredient. It is also used as a raw material for extracting manganese and as a colorant in various applications. In addition, selenium dioxide is widely used in:
- Organic synthesis, especially as an oxidizing agent
- Glass manufacturing, where it serves as a colorant or decolorizing agent
- Photographic toning processes
- Feed and agricultural industries, where it is used to produce sodium selenite and as a precursor for seleniumbased fertilizers
Its versatility makes SeO₂ an important compound in both traditional chemical manufacturing and specialty applications.
General Properties
| Properties | Value |
| Chemical formula | SeO2 |
| CAS # | 7446-08-4 |
| EC / EINECS # | 231-194-7 |
| Molar mass | 110.96 g/mol |
| Appearance | White powder or crystals, turn slightly pink with trace decomposition |
| Melting point | 40 °C (644 °F; 613 K) (sealed tube) |
| Boiling point | 350 °C (662 °F; 623 K) subl. |
| Density | 3.954 g/cm3, solid |
| Solubility in water | 38.4 g/100 mL (20 °C) 39.5 g/100 ml (25 °C) 82.5 g/100 mL (65 °C) |
| Solubility | Soluble in benzene |
Product Availability
We provide high-purity Selenium Dioxide (SeO2) tailored for semiconductor and industrial requirements.
| Purity | 99.99% – 99.999% (4N – 5N) |
| Forms | Powder |
| Particle Sizes | From -50 mesh to – 200 mesh |
| Nanoparticle Sizes | Unavailable at the moment |
| Package | At request |
If you are in need of any high purity Selenium Dioxide (SeO2), please contact our sales team for details at sales@american-gmg.com.