PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Osmium tetroxide | 20816-12-0 | 2471 |
14.01
4.01
11.01
14.02
7.01
11.00
4.09
4.04
4.10
4.07
|
|||||||||
| Formula | Synonyms | |||||||||||
| O4Os | OSMIUM TETROXIDE, MILAS^ REAGENT, OSMIC ACID ANHYDRIDE, OSMIUM OXIDE, OSMIUM OXIDE (OSO4), OSMIUM OXIDE OSO4 (T-4)-, OSMIUM TETRAOXIDE, OSMIUM(IV) OXIDE, REAGENTS, MILAS', TETRAOXOOSMIUM, TETRÓXIDO DE OSMIO (DOT SPANISH), TÉTROXYDE D'OSMIUM (DOT FRENCH) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 254.23 | S | 40.6 | 131.2 | 11 | 27 | 5.1 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.00060 | 0.0084 | 4.0 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0062 | 0.087 | 42 |
Technical Basis
A review of available sources identified exposure limits for this chemical including a TLV-STEL, an AEGL-2 and AEGL-3, and other TWAs. The AEGLs were selected as the TEEL-2 and TEEL-3 due to their priority among the emergency exposure limits (Section 1). Due to insufficient data, an AEGL-1 does not exist for this chemical; therefore, of the available exposure limits, the TLV-STEL was selected as the TEEL-1 basis according to the hierarchy listed in Table 3.1.
• TEEL-1 = TLV-STEL
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL values that are consistent with Rev. 29A*.
• TEEL-1 = TLV-STEL
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL values that are consistent with Rev. 29A*.
References
AEGLs: https://www.epa.gov/aegl/osmium-tetroxide-results-aegl-program
TLV-STEL and other exposure limits: https://www.osha.gov/chemicaldata/308