PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chromic trioxide; (Chromium(VI) oxide (1:3)) | 1333-82-0 | 1463 |
15.01
11.01
15.02
8.00
11.00
4.09
4.06
4.10
4.07
2.00
|
|||||||||
| Formula | Synonyms | |||||||||||
| CrO3 | CHROMIUM TRIOXIDE, ANHYDROUS, 5CHROMIUM TRIOXIDE, ANHYDROUS, CHROMIA (CRO3), CHROMIC ACID, CHROMIC ACID (CRO3): CHROMIC ANHYDRIDE, CHROMIC ACID, SOLID, CHROMIC ACID, SOLUTION, CHROMIC ANHYDRIDE, CHROMIC OXIDE, CHROMIC TRIOXIDE, CHROMIC VI ACID, CHROMIUM (6+) TRIOXIDE, CHROMIUM OXIDE, CHROMIUM OXIDE (CR4O12), CHROMIUM OXIDE [CRO3], CHROMIUM TRIOXIDE, CHROMIUM VI OXIDE, CHROMIUM(VI) OXIDE, CHROMIUM(VI) OXIDE (1:3), MONOCHROMIUM OXIDE, MONOCHROMIUM TRIOXIDE, PURATRONIC, TRIÓXIDO DE CROMO, ANHIDRO (DOT SPANISH), TRIOXYDE DE CHROME, ANHYDRE (DOT FRENCH) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 99.99 | S crystals | 197 | 2.70 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0005 | 0.10 | 30 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.00012 | 0.024 | 7.3 |
Technical Basis
A review of available sources identified the following: TLV-STEL, PEL-C, and IDLH exposure limits for chromic acid and chromates. These data sources were selected according to the hierarchy listed in Table 3.1.
• TEEL-1 = TLV-STEL (0.0005 mg/m3)
• TEEL-2 = PEL-C (0.1 mg/m3)
• TEEL-3 = IDLH (1990, 30 mg/m3)
The recommended TEEL-3 concurs with Rev. 29A. The current TEEL-2 is an exposure limit, a more preferred source than Rev. 29A (derived, according to Table 3.5). Using independent data is preferable to an adjustment. The Rev. 29A TEEL-1 used a weight-adjusted chromium (VI) TLV-TWA for development. A TLV-STEL identified for the chemical of interest is preferred, according to the data hierarchy.
• TEEL-1 = TLV-STEL (0.0005 mg/m3)
• TEEL-2 = PEL-C (0.1 mg/m3)
• TEEL-3 = IDLH (1990, 30 mg/m3)
The recommended TEEL-3 concurs with Rev. 29A. The current TEEL-2 is an exposure limit, a more preferred source than Rev. 29A (derived, according to Table 3.5). Using independent data is preferable to an adjustment. The Rev. 29A TEEL-1 used a weight-adjusted chromium (VI) TLV-TWA for development. A TLV-STEL identified for the chemical of interest is preferred, according to the data hierarchy.
References
https://www.cdc.gov/niosh/idlh/1333820.html
https://www.osha.gov/chemicaldata/235
https://cameochemicals.noaa.gov/chemical/14654