PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Holmium trioxide | 12055-62-8 |
11.00
4.07
7.01
10.00
4.11
|
||||||||||
| Formula | Synonyms | |||||||||||
| Ho2-O3 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 377.859 | S | 2415 | 8.41 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 30 | 330 | 2000 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.9 | 21 | 130 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for holmium trioxide. Additionally, the chemical does not meet GHS hazard criteria and is therefore not classified. Considering this, the PNOS TLV-TWA was selected as the TEEL-1 basis (Section 3.5.2). TEEL-3 and TEEL-2 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TLV-TWA (PNOS, 10 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-1 x 11
• PAC-3 = TEEL-3 = TEEL-2 x 6
This review generated PAC values consistent with Rev. 29A*.
• PAC-1 = TEEL-1 = TLV-TWA (PNOS, 10 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-1 x 11
• PAC-3 = TEEL-3 = TEEL-2 x 6
This review generated PAC values consistent with Rev. 29A*.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Holmium-oxide.