PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Methyl tert-butyl ether; (MTBE) 1634-04-4 2398
15.01
4.01
11.01
15.02
7.01
8.00
11.00
4.09
4.07
3.05
Formula Synonyms
C5H12O METHYL TERT-BUTYL ETHER, 1,1-DIMETHYLETHYL METHYL ETHER, 2-METHOXY-2-METHYL PROPANE, 2-METHOXY-2-METHYLPROPANE, 2-METHYL-2-METHOXY PROPANE, 2-METHYL-2-METHOXYPROPANE, ÉTHER MÉTHYL TERT-BUTYLIQUE (DOT FRENCH), ETHER, TERT-BUTYL METHYL, METHYL 1,1-DIMETHYLETHYL ETHER, METHYL TERT BUTYL ETHER, METHYL TERTIARY BUTYL ETHER, METIL-TER-BUTILÉTER (DOT SPANISH), MTBE, T-BUTYL METHYL ETHER, TERT-BUTOXYMETHANE, TERT-BUTYL METHYL ETHER
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
88.15 L -108.6 55 75 -2 0.7353 16000
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
50 570 5300
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
180 2100 19000
Technical Basis
A review of available sources identified AEGLs for this chemical. The AEGLs were selected due to their priority among Protective Action Criteria (Section 1). Values in units mg/m3 are reported as published in the technical support Table 1, per handbook guidance (Section 3.4.7.2).
• PAC-1 = AEGL-1
• PAC-2 = AEGL-2
• PAC-3 = AEGL-3
This review generated PAC ppm values consistent with Rev. 29A. Difference in the reported PAC-2 value in units mg/m3 may be due to conversion and rounding of this value, instead of use of the source value. Note: The AEGL-3 values require “safety considerations against the hazard(s) of explosion(s)” (≥10% LEL).
References
AEGLs (Table 1) and chemical information (Table 2) retrieved from: https://www.epa.gov/aegl/methyl-tertiary-butyl-ether-mtbe-results-aegl-program
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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.