PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Methane 74-82-8 1971
17.00
7.01
4.08
4.05
4.07
5.00
4.11
Formula Synonyms
CH4 METHANE, BIOGAS, FIRE DAMP, MARSH GAS, METANO (DOT SPANISH), MÉTHANE (DOT FRENCH), METHANE, COMPRESSED, METHANE, REFRIGERATED LIQUID, METHYL HYDRIDE, NATURAL GAS, R 50, R 50 (REFRIGERANT), UN 1971, UN 1972, METHANE, REFRIGERATED LIQUID (CRYOGENIC LIQUID),
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
16.04 G -182.47 -161.48 750 -161.7 0.4228 @ -162°C 50000
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
65000*** 230000*** 400000***
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
43000 150000 260000
Technical Basis
No technical basis available
References
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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.