Selenium dioxide appears as a white or creamy-white volatile lustrous crystal or crystalline powder with a pungent sour smell. Melting point 340 deg C. Density 3.954 g / cm3. Toxic by ingestion and inhalation.
Corrosive
Acute toxic
Health hazard
Environmental hazard
⚠️ For information only; not a substitute for the official Safety Data Sheet (SDS).
Selenium dioxide appears as a white or creamy-white volatile lustrous crystal or crystalline powder with a pungent sour smell. Melting point 340 deg C. Density 3.954 g / cm3. Toxic by ingestion and inhalation.
| Physical Description | Selenium dioxide appears as a white or creamy-white volatile lustrous crystal or crystalline powder with a pungent sour smell. Melting point 340 deg C. Density 3.954 g / cm3. Toxic by ingestion and… |
| Color/Form | Lustrous tetragonal needles; yellowish green vapor |
| Odor | Vapor has a pungent sour smell |
| Melting Point | 340 °C under pressure |
| Boiling Point | 599 °F at 760 mmHg (sublimes) (USCG, 1999) |
| Density | 3.95 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | Soluble in concentrated sulfuric acid |
| Vapor Pressure | 12.5 mm Hg at 70 °C; 20.2 mm Hg at 94 °C; 39.0 mm Hg at 181 °C; 760 mm Hg at 315 °C; 848 mm Hg at 320 °C |
| Refractive Index | Index of refraction: less than 1.76 at 20 °C/D |
| Stability/Shelf Life | Stable to light and heat. |
| IUPAC Name | selenium dioxide |
| Molecular Formula | O2Se |
| Molecular Weight | 110.97 g/mol |
| CAS | 7446-08-4 |
| SMILES | O=[Se]=O |
| InChIKey | JPJALAQPGMAKDF-UHFFFAOYSA-N |
| Catalog No | KC.1910026 |
| Pack sizes | 100GM · 500GM |
⚠️ For information only; not a substitute for the official SDS.