OSMIUM TETROXIDE†
| CAS # | 20816-12-0 |
|---|---|
| Formula |
O₄Os |
| Synonyms |
osmic acid anhydride; osmium oxide |
| Physical description | Colorless, crystalline solid or pale-yellow mass with an unpleasant, acrid, chlorine-like odor. | ||
|---|---|---|---|
| Boiling point | 266°F | Molecular weight | 254.2 |
| Freezing point/melting point | 105°F | Vapor pressure | 7 mmHg |
| Flash point | Vapor density | ||
| Specific gravity | 5.1 | Ionization potential | 12.60 eV |
| Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
| NFPA health rating | NFPA fire rating | ||
| NFPA reactivity rating | NFPA special instruction | ||
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Analyte code (IMIS no.) | |||
|---|---|---|---|
| Sampling group | |||
| Sampler/Sampling media | |||
| Sampling time* | |||
| Sampling volume (TWA)* | |||
| Sampling flow rate (TWA)* | |||
| Sampling volume (STEL/Peak/C)* | |||
| Sampling flow rate (STEL/Peak/C)* | |||
| Analytical method instruments | |||
| Method reference | |||
| Notes | |||
| Special requirements |
* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
| Wipe Sampler/Sampling media | |
|---|---|
| Bulk Method |
| Device | |||||
|---|---|---|---|---|---|
| Model/Type | |||||
|
Sampling information (see manufacturer instructions) |
|
OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
|||||
|---|---|---|---|---|---|---|---|
| PEL-TWA |
0.002 mg/m³ |
REL-TWA |
0.0002 ppm (0.002 mg/m³) |
TLV-TWA |
0.0002 ppm [1979] |
PEL-TWA |
0.0002 ppm (0.002 mg/m³) |
| PEL-STEL | REL-STEL |
0.0006 ppm (0.006 mg/m³) |
TLV-STEL |
0.0006 ppm [1979] |
PEL-STEL |
0.0006 ppm (0.006 mg/m³) |
|
| PEL-C | REL-C | TLV-C | PEL-C | ||||
| Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
| Notes: | Notes: | Notes: | Notes: | ||||
| Health factors: See NIH-NLM PubChem. | IDLH |
1 mg/m³ |
|||||
| Carcinogenic classifications: Not listed | Notes: | ||||||
| AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: | |||||||
Additional Resources and Literature References
|
NOAA: CAMEO Chemicals - Osmium tetroxide NIOSH: Pocket Guide to Chemical Hazards - Osmium tetroxide Literature References
|
Last Updated Date : 01/31/2018