PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Methyl chloride 74-87-3 1063
4.01
4.08
4.05
7.01
8.00
7.00
4.09
4.06
4.10
4.07
Formula Synonyms
CH3Cl METHYL CHLORIDE, ARTIC, CHLOROMETHANE, CHLORURE DE MÉTHYLE (DOT FRENCH), CLORURO DE METILO (DOT SPANISH), GAS REFRIGERANTE R-40 (DOT SPANISH), GAZ RÉFRIGÉRANT R-40 (DOT FRENCH), HCC 40, METHANE, CHLORO-, MONOCHLOROMETHANE, R 40, R 40 (REFRIGERANT), RCRA WASTE NUMBER U045, REFRIGERANT GAS R-40, UN 1063
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
50.49 G -97.7 -24.09 750 -24.4 0.911 81000
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
150 910 3000
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
310 1900 6200
Technical Basis
A review of available sources identified AEGLs (AEGL-3 and AEGL-2) and an ERPG-1 for this chemical. The AEGL-3 and AEGL-2 were selected as the TEEL-3 and TEEL-2, respectively, due to their priority among the emergency exposure limits (Section 1). Values in units mg/m3 are reported as published in the technical support summary table, per handbook guidance (Section 3.4.7.2). The ERPG-1 was selected as the TEEL-1 due to its priority among emergency exposure limits (Section 1).
• TEEL-1 = ERPG-1
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL ppm values consistent with Rev. 29A. The difference in the reported TEEL-1 value in units mg/m3 may be due to conversion and rounding of these values, instead of use of source values.
References
AEGLs (Table 6-1) and chemical information (Table 6-2) retrieved from: https://www.epa.gov/aegl/methyl-chloride-result-aegl-program
ERPG-1: https://www.osha.gov/chemicaldata/556
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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.