PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Potassium beryllium oxide | z-0047 |
4.00
3.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| Be2-K2-O3 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 144.2 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0012 | 0.025 | 0.10 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.00020 | 0.0042 | 0.017 |
Technical Basis
A review of available sources identified the following: exposure limits (PEL-TWA, TLV-TWA, ERPGs) for beryllium (CASRN: 7440-41-7). The ERPGs for beryllium were selected as the TEEL-3 and TEEL-2 values. The TLV-TWA for beryllium was selected as the TEEL-1, and a compound adjustment factor was applied.
• TEEL-1 = MW-adjusted TLV-TWA (beryllium; CASRN 7440-41-7, 0.00005 mg/m3) x 3
• TEEL-2 = EPRG-2 (beryllium; CASRN 7440-41-7, 0.025 mg/m3)
• TEEL-3 = EPRG-3 (beryllium; CASRN 7440-41-7, 0.1 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A and current TEEL-3 and TEEL-2 sources, ERPGs, are consistent; however, the Rev. 29A TEELs applied a molecular-weight adjustment, while the current values are not adjusted, in accordance with Section 3.2.2. The Rev. 29A TEEL-1 was derived from the TEEL-2 (Table 3.5), while the current TEEL-1 basis is a molecular weight adjusted TLV-TWA exposure limit.
• TEEL-1 = MW-adjusted TLV-TWA (beryllium; CASRN 7440-41-7, 0.00005 mg/m3) x 3
• TEEL-2 = EPRG-2 (beryllium; CASRN 7440-41-7, 0.025 mg/m3)
• TEEL-3 = EPRG-3 (beryllium; CASRN 7440-41-7, 0.1 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A and current TEEL-3 and TEEL-2 sources, ERPGs, are consistent; however, the Rev. 29A TEELs applied a molecular-weight adjustment, while the current values are not adjusted, in accordance with Section 3.2.2. The Rev. 29A TEEL-1 was derived from the TEEL-2 (Table 3.5), while the current TEEL-1 basis is a molecular weight adjusted TLV-TWA exposure limit.
References
Beryllium oxide description: https://pubchem.ncbi.nlm.nih.gov/compound/Beryllium-oxide
Beryllium exposure limits: https://www.osha.gov/chemicaldata/531
Beryllium ERPG: https://cameochemicals.noaa.gov/chemical/238
Beryllium TLV-TWA. Retrieved from: TLV-TWA. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Beryllium