Melting point :40°C
Boiling point :130 °C
Density :1.04
bulk density :1500kg/m3
vapor density :8.8 (vs air)
vapor pressure :7 mmHg at 20 °C
Flash point :-40 °C
storage temp. :2-8°C
solubility :Soluble in alcohol, ether, chloroform, benzene, ammonium hydroxide, phosphorus oxychloride and carbon tetrachloride
form :Solution
color :White to yellow,or lemon yellow
Specific Gravity :5.10
Odor :Acrid, chlorine-like odor detectable at 2 ppm (20 mg/m3)
PH :6 (20°C, 25g/L in H2O)
Water Solubility :Soluble in chloroform, alcohol and ethers.Soluble in water, organic solvents, benzene, alcohol, ether, ammonium hydroxide, phosphorus oxychloride and carbon tetrachloride.
Sensitive :Air Sensitive
Merck :14,6893
crystal system :Monoclinic
Space group :C2/c
Lattice constant :

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.9379	0.4515	0.8632	90	116.6	90	0.3268

Stability :Stable. Incompatible with strong acids, hydrogen chloride, organic materials, finely powdered metals.
CAS DataBase Reference :20816-12-0(CAS DataBase Reference)
NIST Chemistry Reference :Osmium tetraoxide(20816-12-0)
EPA Substance Registry System :Osmium tetroxide (20816-12-0)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
Precautionary statements:	P260 Do not breathe dust/fume/gas/mist/vapours/spray. P270 Do not eat, drink or smoke when using this product. P280 Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.