PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Isobutyl chloroformate 543-27-1
14.01
14.02
11.01
4.07
Formula Synonyms
C5.H9.Cl.O2
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
136.5779 L 128.7 1.053
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
0.60 2.2 6.7
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
3.4 12 37
Technical Basis
Technical Justification A review of available sources identified an AEGL-2, AEGL-3, and a MAK-TWA for this chemical. The AEGLs were selected as the TEEL-2 and TEEL-3 due to their priority among the emergency exposure limits (Section 1). THE MAK-TWA was selected as the TEEL-1 basis.
• TEEL-1 = MAK-TWA x 3 (0.2 ppm)
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL ppm values consistent with Rev. 29A. Differences in the reported TEEL-2 and TEEL-3 values in units mg/m3 may be due to conversion and rounding of these values instead of using source values. Values in units mg/m3 are reported as published in the technical support document Table S-1, per handbook guidance (Section 3.4.7.2).
References
AEGLs (Table S-1, Table 2-47) and chemical information (Table 2-49) retrieved from: https://www.epa.gov/aegl/isobutyl-chloroformate-results-aegl-program
MAK-TWA, retrieved from: https://ilv.ifa.dguv.de/limitvalues/34883
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.