Selenium dioxide
CAS 7446-08-4
EC 231-194-7
Formula O2Se
MW 110.96 g/mol
Oxidizers & Peroxides ElectronicsMining & Metals Catalysis
Description
Selenium dioxide (CAS 7446-08-4, EC 231-194-7, formula O2Se) is an inorganic oxidising compound also known as selenium(IV) oxide or selenous anhydride, with reference designations including ED 30 and NSC 56753. It carries no assigned E-code and is classified under HS code 28112900 within the Oxidizers and Peroxides category.
In electronics manufacturing, selenium dioxide serves as a selective oxidant in the production of semiconductors and photovoltaic cells, where it facilitates controlled surface oxidation at the component level. In mining and metallurgy, it functions as a catalyst in the refining of copper and other non-ferrous metals, promoting oxidation reactions that separate impurities from the base metal.
Selenium dioxide is supplied as a technical-grade crystalline powder, subject to REACH registration requirements for European procurement. Buyers should confirm supplier SDS documentation and substance authorisation status under REACH Annex XIV prior to ordering. Packaging formats typically include sealed drums or multi-layer bags suited to moisture-sensitive materials.
In electronics manufacturing, selenium dioxide serves as a selective oxidant in the production of semiconductors and photovoltaic cells, where it facilitates controlled surface oxidation at the component level. In mining and metallurgy, it functions as a catalyst in the refining of copper and other non-ferrous metals, promoting oxidation reactions that separate impurities from the base metal.
Selenium dioxide is supplied as a technical-grade crystalline powder, subject to REACH registration requirements for European procurement. Buyers should confirm supplier SDS documentation and substance authorisation status under REACH Annex XIV prior to ordering. Packaging formats typically include sealed drums or multi-layer bags suited to moisture-sensitive materials.
Physical Properties
| Melting Point | 340 °C |
| Boiling Point | 684.9 °C(lit.) |
| Density | 3.954 g/cm³ @ Temp: 15 °C |
| Flash Point | 315°C |
| Appearance | Selenium dioxide is white to slightly reddish crystalline solid or yellow liquid which forms a yellowgreen vapor. It has a sour and pungent odor. Odor threshold in air50.0002 milligram per cubic meter. |
| Color | white |
| Form | powder |
| Water Solubility | 38.4 g/100 mL (14 ºC) |
| Vapor Pressure | 1 mm Hg ( 157 °C) |
| Refractive Index | nD20 <1.76 |
| pH | 2 (10g/l, H2O, 20℃) |
Safety & Handling (Learn More)
Danger GHS05 GHS06 GHS08 GHS09 GHS07
H
H300H301H314H318H319H331H370H371H372H373H400H410
P
P260P261P264P270P271P273P280P316P317P319P321P330P363P391P405P501P264+P265P301+P316P304+P340P308+P316P337+P317P403+P233P301+P330+P331P302+P361+P354P305+P351+P338P305+P354+P338
Trade & Regulatory
| HS Code | 28112900 |
| UN Number | 3440 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 2 |
Other Names
Selenous anhydrideED 30SELENIUMED 30 (oxide)Selenium(IV) oxideSELENIOUS ANHYDRIDESELENIUM AA STANDARDSelenium oxide (SeO2)
Related Products
Raw Materials
Derivatives
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