HazMat Tool — substance information

Helium, compressed

HMT 15 June 2026
Reference only — HMT snapshot for inspection and audit support; not a shipping paper, placard mandate, or CVI record. Use Print / PDF below for field notes.
UN / ID
UN 1046
Hazard class
2.2
Packing group
ERG guide
ERG 121
Special provisions
Source
49 CFR §172 (15 June 2026)

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Helium, compressed


Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements, and it does not have a melting point at standard pressures. It is the second-lightest and second-most abundant element in the observable universe, after hydrogen Wikipedia

Substance Data

Source: PubChem (HSDB, 04.12.2019)

CAS-Number

7440-59-7

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 121

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.2
Non-toxic, non-flammable gases

(4) Identification number Help

UN 1046

(5) Packing Group Help

n/a

(6) Labels Help

Non-toxic, non-flammable gases (2.2)

(7) Special Provisions (§172.102) Help

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions306, 307see 49 CFR §173.306, 307
(8B) Non-bulk302see 49 CFR §173.302
(8C) Bulk302, 314see 49 CFR §173.302, 314

(9) Quantity Limits Help

(9A) Passenger aircraft/rail75 kg
(9B) Cargo aircraft only150 kg

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation chart for load, transport, and storage

This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.

Prohibited Must not be loaded, transported, or stored together in the same vehicle or facility.
Permitted May be loaded, transported, or stored together.
Restricted May be loaded, transported, or stored together only with restrictions.

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UN / IDProper shipping nameHazard class
UN 1963Helium, refrigerated liquid (cryogenic liquid)2.2