Melting point :217 °C (lit.)
Boiling point :684.9 °C (lit.)
Density :4.81 g/mL at 25 °C (lit.)
vapor pressure :<1 Pa (20 °C)
storage temp. :no restrictions.
solubility :H₂O: soluble
form :powder
Specific Gravity :4.81
color :White to creamy white
Resistivity :1.2 μΩ-cm, 0°C
Water Solubility :Insoluble
Merck :13,8505
Exposure limits :TLV-TWA 0.2 mg(Se)/m³ (ACGIH, MSHA, and OSHA); IDLH 100 mg/m³.
Dielectric constant :6.1（Ambient）
Stability :Stable. Incompatible with strong acids, strong oxidizing agents and most common metals. Combustible.
InChIKey :SPVXKVOXSXTJOY-UHFFFAOYSA-N
CAS DataBase Reference :7782-49-2(CAS DataBase Reference)
IARC :3 (Vol. 9, Sup 7) 1987
NIST Chemistry Reference :Selenium atom(7782-49-2)
EPA Substance Registry System :Selenium (7782-49-2)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501 H413 May cause long lasting harmful effects to aquatic life Hazardous to the aquatic environment, long-term hazard Category 4
Precautionary statements:	P260 Do not breathe dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P273 Avoid release to the environment. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P314 Get medical advice/attention if you feel unwell.