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 Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.0012 0.025 0.10
Converted PAC Values (ppm)
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.
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
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