PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Helium 7440-59-7 1046
17.00
7.01
4.01
4.05
11.00
4.08
4.07
5.00
10.00
5.10
Formula Synonyms
He HELIUM, ATOMIC HELIUM, HELIUM, REFRIGERATED LIQUID (CRYOGENIC LIQUID), HELIO (DOT SPANISH), HELIO, COMPRIMIDO (DOT SPANISH), HÉLIUM (DOT FRENCH), HELIUM, COMPRESSED, HÉLIUM, COMPRIMÉ (DOT FRENCH), HELIUM-4, O-HELIUM, P-HELIUM
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
4 G -272.2 -268.9 0.147 @ -270.8°C
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
11000 38000 65000
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.