PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Butyl chloroformate, n- | 592-34-7 | 2743 |
14.01
14.02
11.01
7.01
11.00
4.07
4.01
4.11
|
|||||||||
| Formula | Synonyms | |||||||||||
| C5.H9.Cl.O2 | N-BUTYL CHLOROFORMATE, BUTOXYCARBONYL CHLORIDE, BUTYL CHLOROCARBONATE, BUTYL CHLOROFORMATE, CARBONOCHLORIDIC ACID, BUTYL ESTER, CHLOROCARBONIC ACID, N-BUTYL ESTER, CHLOROFORMIATE DE N-BUTYLE (DOT FRENCH), CHLOROFORMIC ACID BUTYL ESTER, CHLOROFORMIC ACID, N-BUTYL ESTER, FORMIC ACID, CHLORO-, BUTYL ESTER, N-BUTIL CLOROFORMIATO (DOT SPANISH), N-BUTYL CHLOROCARBONATE | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 136.58 | L | 142 | 1.074 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.60 | 2.2 | 6.7 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 3.4 | 12 | 37 |
Technical Basis
A review of available sources identified AEGLs and a MAK-TWA for this chemical. The AEGLs were selected as the TEELs due to their priority among the emergency exposure limits (Section 1). Table S-1 reports AEGLs in units of mg/m3 that are significantly different than what would be expected for conversion at standard temperature and pressure (STP; 25°C, 1 atm). The reported TEEL-2 is 27 mg/m3, while a converted TEEL-2 is 12 mg/m3. Similarly, the reported TEEL-3 is 80 mg/m3, while a converted TEEL-3 is 37 mg/m3. Considering this, the TEEL-3 and TEEL-2 ppm values were converted to units of mg/m3 at STP; these converted values were then rounded to two significant figures (Section 3.4.7.2). The MAK-TWA was selected as the TEEL-1 basis.
• TEEL-1 = MAK-TWA (0.2 ppm, 1.1 mg/m3) x 3
• TEEL-2 = AEGL-2 (2.2 ppm)
• TEEL-3 = AEGL-3 (6.7 ppm)
This review generated TEEL values consistent with Rev. 29A*. Use of converted and rounded AEGLs in units of mg/m3, instead of using the values reported (Section 3.4.7.2), is in accordance with Section 4.2-4.3.
• TEEL-1 = MAK-TWA (0.2 ppm, 1.1 mg/m3) x 3
• TEEL-2 = AEGL-2 (2.2 ppm)
• TEEL-3 = AEGL-3 (6.7 ppm)
This review generated TEEL values consistent with Rev. 29A*. Use of converted and rounded AEGLs in units of mg/m3, instead of using the values reported (Section 3.4.7.2), is in accordance with Section 4.2-4.3.
References
AEGLs (pg. 166) and chemical information (Table 2-1, pg. 11) retrieved from: https://www.epa.gov/aegl/n-butyl-chloroformate-results-aegl-program
MAK-TWA, pg. 48: https://onlinelibrary.wiley.com/doi/pdf/10.1002/9783527695539.oth1