PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Barium | 7440-39-3 | 1400 |
18.00
15.01
11.01
15.02
4.08
7.00
4.06
4.07
7.11
12.00
|
|||||||||
| Formula | Synonyms | |||||||||||
| Ba | BARIUM, BARIO (DOT SPANISH), BARIUM ELEMENT, BARYUM (DOT FRENCH) | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 137.327 | S | 727 | 1897 | 638 | 3.62 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.5 | 42 | 250 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.27 | 7.5 | 45 |
Technical Basis
A review of available sources identified the following: IDLH and TLV-TWA exposure limits. These sources were selected according to the hierarchy listed in Table 3.1. The effective 1990 IDLH exposure limit for this substance was selected as the TEEL-3. A TEEL-2 was derived according to Table 3.5. The TLV-TWA was selected as the TEEL-1 basis.
• TEEL-1 = TLV-TWA x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990)
This review generated TEEL-3 and TEEL-2 values that are inconsistent with Rev 29A. The Rev. 29A and current TEEL-3 source, a 1990 IDLH, is consistent; however, the current value is the reported “effective” limit, a more conservative value. The Rev. 29A and current TEEL-2 methodology are the same, with difference in values due to the change in TEEL-3. The Rev. 29A and current TEEL-1 source and values are consistent.
• TEEL-1 = TLV-TWA x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990)
This review generated TEEL-3 and TEEL-2 values that are inconsistent with Rev 29A. The Rev. 29A and current TEEL-3 source, a 1990 IDLH, is consistent; however, the current value is the reported “effective” limit, a more conservative value. The Rev. 29A and current TEEL-2 methodology are the same, with difference in values due to the change in TEEL-3. The Rev. 29A and current TEEL-1 source and values are consistent.
References
https://www.cdc.gov/niosh/idlh/7440393.html
https://www.osha.gov/chemicaldata/530