HazMat Tool — substance information

Compressed gas, n.o.s

HMT May 2026
UN / ID
UN 1956
Hazard class
2.2
Packing group
—
ERG guide
ERG 126
Special provisions
—
Source
49 CFR §172 (2026/05)

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Compressed gas, n.o.s

Emergency Response Guide No. 126

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.2
Non-toxic, non-flammable gases

(4) Identification number Help

UN 1956

(5) Packing Group Help

n/a

(6) Labels Help

Non-toxic, non-flammable gases (2.2)

(1) Symbols Help


This entry is signed with "G". The letter "G" identifies proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses, in association with the basic description. (See §172.203(k)).

(7) Special Provisions (§172.102) Help

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

(8A) Exceptions306, 307see 49 CFR §173.306, 307
(8B) Non-bulk302, 305see 49 CFR §173.302, 305
(8C) Bulk314, 315see 49 CFR §173.314, 315

(9) Quantity Limits Help

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

(10) Vessel stowage Help

(10A) Location
(10B) Other n/a

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.

Hazard
class		8
 Help		7
 Help		6.1
 Help		5.2
 Help		5.1
 Help		4.3
 Help		4.2
 Help		4.1
 Help		3
 Help		2.3B
 Help		2.3A
 Help		2.2
 Help		2.1
 Help		1.6
 Help		1.5
 Help		1.4
 Help		1.3
 Help		1.1/1.2
 Help
1.1/1.2 Help
1.3 Help
1.4 Help
1.5 Help
1.6 Help
2.1 Help
2.2 Help
2.3A Help
2.3B Help
3 Help
4.1 Help
4.2 Help
4.3 Help
5.1 Help
5.2 Help
6.1 Help
7 Help
8 Help
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.

Similar substances

UN / IDProper shipping nameHazard class
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UN 3516Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone B2.3
UN 3516Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone C2.3
UN 3516Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone D2.3
UN 3514Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone A2.3
UN 3514Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone B2.3
UN 3514Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone C2.3
UN 3514Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone D2.3
UN 3515Adsorbed gas, toxic, oxidizing, n.o.s. Inhalation hazard zone A2.3
UN 3515Adsorbed gas, toxic, oxidizing, n.o.s. Inhalation hazard zone B2.3
UN 3515Adsorbed gas, toxic, oxidizing, n.o.s. Inhalation hazard zone C2.3
UN 3515Adsorbed gas, toxic, oxidizing, n.o.s. Inhalation hazard zone D2.3
UN 3308Liquefied gas, toxic, corrosive, n.o.s. Inhalation Hazard Zone B2.3
UN 3308Liquefied gas, toxic, corrosive, n.o.s. Inhalation Hazard Zone C2.3
UN 3308Liquefied gas, toxic, corrosive, n.o.s. Inhalation Hazard Zone D2.3