PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Methyl chloroformate; (Methyl chlorocarbonate) | 79-22-1 | 1238 |
14.01
14.02
11.01
4.08
4.05
7.01
7.00
11.00
4.01
4.07
|
|||||||||
| Formula | Synonyms | |||||||||||
| C2H3ClO2 | METHYL CHLOROFORMATE, CARBONOCHLORIDIC ACID, METHYL ESTER, CARBONOCHLORIDIC ACID, METHYLESTER, CHLOROCARBONIC ACID METHYL ESTER, CHLOROCARBONIC ACID, METHYL ESTER, CHLOROFORMIATE DE MÉTHYLE (DOT FRENCH), CHLOROFORMIC ACID METHYL ESTER, CHLOROFORMIC ACID, METHYL ESTER, CLOROFORMIATO DE METILO (DOT SPANISH), FORMIC ACID, CHLORO-, METHYL ESTER, K-STOFF, METHOXYCARBONYL CHLORIDE, METHYL CARBONOCHLORIDATE, METHYL CHLOROCARBONATE, TL 438 | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 94.5 | L | 70.5 | 108.5 | 25 | 1.22 @ 20°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.40 | 2.2 | 6.7 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.5 | 8.5 | 26 |
Technical Basis
A review of available sources identified a MAK-STEL, AEGL-2, and AEGL-3 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). AEGL values in units mg/m3 are reported as published in the technical support table S-1, per handbook guidance (Section 3.4.7.2). Due to insufficient data, an AEGL-1 is not recommended; therefore, the MAK-STEL was selected as the TEEL-1.
• TEEL-1 = MAK-STEL
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL-1 and TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a MAK-TWA, while the recommended TEEL-1 is a higher priority MAK-STEL. The TEEL-2 and TEEL-3 methodology remain consistent; the minor difference in the reported TEEL-2 value in units mg/m3 may be due to conversion and rounding of the value, instead of use of the source value.
• TEEL-1 = MAK-STEL
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL-1 and TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a MAK-TWA, while the recommended TEEL-1 is a higher priority MAK-STEL. The TEEL-2 and TEEL-3 methodology remain consistent; the minor difference in the reported TEEL-2 value in units mg/m3 may be due to conversion and rounding of the value, instead of use of the source value.
References
AEGLs (Table S-1) and chemical information (Table 2-6) retrieved from: https://www.epa.gov/aegl/methyl-chloroformate-results-aegl-program
MAK-STEL: https://ilv.ifa.dguv.de/limitvalues/39474