S9779528
Osmium tetroxide , ≥99% , 20816-12-0
Synonym(s):
‘Osmic acid’;Osmium(VIII)-oxide
CAS NO.：20816-12-0
Empirical Formula: O4Os
Molecular Weight: 254.23
MDL number: MFCD00011150
EINECS: 244-058-7
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | 40°C |
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| Boiling point: | 130 °C |
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| Density | 1.04 |
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| vapor density | 8.8 (vs air) |
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| vapor pressure | 7 mmHg at 20 °C |
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| Flash point: | -40 °C |
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| storage temp. | 2-8°C |
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| solubility | Soluble in alcohol, ether, chloroform, benzene, ammonium hydroxide, phosphorus oxychloride and carbon tetrachloride |
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| form | Solution |
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| color | White to yellow,or lemon yellow |
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| Specific Gravity | 5.10 |
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| Odor | Acrid, chlorine-like odor detectable at 2 ppm (20 mg/m3) |
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| Water Solubility | Soluble in chloroform, alcohol and ethers.Soluble in water, organic solvents, benzene, alcohol, ether, ammonium hydroxide, phosphorus oxychloride and carbon tetrachloride. |
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| Sensitive | Air Sensitive |
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| Merck | 14,6893 |
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| crystal system | Monoclinic |
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| Space group | C2/c |
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| Lattice constant |
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| Stability: | Stable. Incompatible with strong acids, hydrogen chloride, organic materials, finely powdered metals. |
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| CAS DataBase Reference | 20816-12-0(CAS DataBase Reference) |
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| NIST Chemistry Reference | Osmium tetraoxide(20816-12-0) |
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| EPA Substance Registry System | Osmium tetroxide (20816-12-0) |
Description and Uses
Osmium tetroxide is used in histopathological laboratories to stain the adipose tissue and as a stabilizing agent in scanning electron microscopy. In the chemical industry, it is used as a catalyst in the organic synthesis, particularly as the oxidizing agent in olefin-to-glycol conversion (546, 567). In the past, osmium tetroxide in the form of aqueous solution was used in forensic medicine to examine fingerprints. Osmium tetroxide is also used in medicine to treat rheumatoid arthritis.
Safety
| Symbol(GHS) |   GHS05,GHS06 |
| Signal word | Danger |
| Hazard statements | H300+H310+H330-H314 |
| Precautionary statements | P260-P270-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | O,T,C,T+,F,Xi,Xn |
| Risk Statements | 8-23/24/25-40-34-26/27/28-42/43-11-67-66-36/37/38-19-36/38-36/37 |
| Safety Statements | 17-26-27-36/37/39-45-7/9-36/37-16-28-23 |
| OEB | E |
| OEL | TWA: 0.002 mg/m3 (0.0002 ppm), STEL: 0.006 mg/m3 (0.0006 ppm) |
| RIDADR | UN 3175 4.1/PG 2 |
| WGK Germany | 3 |
| RTECS | RN1140000 |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | I |
| HS Code | 28439090 |
| Hazardous Substances Data | 20816-12-0(Hazardous Substances Data) |
| Toxicity | LD50 oral (rat) 14 mg/kg LCLO inhal (rat) 40 ppm (4 h) PEL (OSHA) 0.0002 ppm (0.002 mg/m3) TLV-TWA (ACGIH) 0.0002 ppm (0.002 mg/m3) STEL (ACGIH) 0.0006 ppm (0.006 mg/m3) |
| IDLA | 1 mg Os/m3 |
