| General Characteristics |
Hydrogen Selenide is a colorless, flammable, extremely toxic gas with a very unpleasant odor. It begins to dissociate at approximately 160°C. It decomposes in air to form a red selenium precipitate. It is shipped as a liquefied gas under its own vapor pressure. |
| |
| Physical Properties |
| Molecular Weight |
80.97 |
| Flammability Limits in air |
Not Available |
Specific Gravity,
Gas @ 70°F(21.1°C), 1 atm(Air=1) |
2.8 |
Density,
Gas @ 70°F(21.1°C), 1 atm |
0.209lbs/ft^3 (3.34g/l) |
Specific Volume,
Gas @ 70°F(21.1°C), 1 atm |
4.80ft^3/lb (0.301l/g) |
| Boiling Point @ 1 atm |
-43.6°F (-42.0°C) |
| Melting Point @ 1 atm |
-86.6°F (-65.9°C) |
| Critical Temperature |
280.4°F (138.0°C) |
| Critical Pressure |
1293.2 psia (89 bar) |
| Toxicity |
| PEL/TLV |
0.05 ppm |
| LC50 |
2 ppm |
| IDLH |
2 ppm |
