PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Hydrogen 1333-74-0 1049
17.00
18.00
4.11
4.01
4.05
11.00
Formula Synonyms
H2 HYDROGEN, DIHYDROGEN, HIDRÓGENO (DOT SPANISH), HIDRÓGENO, COMPRIMIDO (DOT SPANISH), HYDROGEN (H2), HYDROGEN MOLECULE, HYDROGEN, COMPRESSED, HYDROGÈNE (DOT FRENCH), HYDROGÈNE, COMPRIMÉ (DOT FRENCH), MOL. HYDROGEN, MOLECULAR HYDROGEN, ORTHOHYDROGEN, PARAHYDROGEN, PROTIUM, HYDROGEN, REFRIGERATED LIQUID (CRYOGENIC LIQUID)
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
2.02 G -259.18 -252.8 1240000 25 0.070 @ -253°C 40000
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
5400 19000 33000
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.