HazMat Tool — substance information

Liquefied gas, flammable, n.o.s.

HMT May 2026

UN / ID: UN 3161
Hazard class: 2.1
Packing group: —
ERG guide: ERG 115
Special provisions: SP T50
Source: 49 CFR §172 (2026/05)

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Liquefied gas, flammable, n.o.s.

Liquefied gas (sometimes referred to as liquid gas) is a gas that has been turned into a liquid by cooling or compressing it. Examples of liquefied gases include liquid air, liquefied natural gas, and liquefied petroleum gas. Wikipedia

Emergency Response Guide No. 115

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.1
Flammable gases

(4) Identification number

UN 3161

(5) Packing Group

n/a

(6) Labels

Cargo Aircraft Only (Cargo Aircraft Only)

(1) Symbols

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)

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.

T50	When portable tank instruction T50 is indicated in Column (7) of the §172.101 Hazardous Materials Table, the applicable liquefied compressed gas and chemical under pressure descriptions are authorized to be transported in portable tanks in accordance with the requirements of §173.313. Browse special provision T50

(8) Packing Authorizations (§173.***)

(8A) Exceptions	306	see 49 CFR §173.306
(8B) Non-bulk	304	see 49 CFR §173.304
(8C) Bulk	314, 315	see 49 CFR §173.314, 315

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	150 kg

(10) Vessel stowage

(10A) Location

Stowage category “D” means the material must be stowed “on deck only” on a cargo vessel or on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers or one passenger per each 3 m of overall vessel length, but the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

40	see 49 CFR §176.84

Source: 49 CFR §176.84

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

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

Similar substances

UN / ID	Proper shipping name	Hazard class
UN 3478	Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment, containing liquefied flammable gas	2.1
UN 1058	Liquefied gases, non-flammable charged with nitrogen, carbon dioxide or air	2.2
UN 3309	Liquefied gas toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone B	2.3
UN 3309	Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone A	2.3
UN 3309	Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone C	2.3
UN 3309	Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone D	2.3
UN 3160	Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone A	2.3
UN 3160	Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone B	2.3
UN 3160	Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone C	2.3
UN 3160	Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone D	2.3
UN 3358	Refrigerating machines, containing flammable, non-toxic, liquefied gas	2.1
UN 3310	Liquefied gas, toxic, oxidizing, corrosive, n.o.s. Inhalation Hazard Zone A	2.3
UN 3310	Liquefied gas, toxic, oxidizing, corrosive, n.o.s. Inhalation Hazard Zone B	2.3
UN 3310	Liquefied gas, toxic, oxidizing, corrosive, n.o.s. Inhalation Hazard Zone C	2.3
UN 3310	Liquefied gas, toxic, oxidizing, corrosive, n.o.s. Inhalation Hazard Zone D	2.3