HazMat Tool — substance information

Air, refrigerated liquid, (cryogenic liquid)

HMT 15 June 2026

UN / ID: UN 1003
Hazard class: 2.2
Packing group: n/a (multiple — see tabs)
ERG guide: ERG 122
Special provisions: SP T75, SP TP5, SP TP22
Source: 49 CFR §172 (15 June 2026)

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Air, refrigerated liquid, (cryogenic liquid)

Emergency Response Guide No. 122

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

Packing group
Packing group

(3) Hazard Class

2.2
Non-toxic, non-flammable gases

(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.

T75	When portable tank instruction T75 is referenced in Column (7) of the § 172.101 Table, the applicable refrigerated liquefied gases are authorized to be transported in portable tanks in accordance with the requirements of § 178.277 of this subchapter. Browse special provision T75
TP5	For a portable tank used for the transport of flammable refrigerated liquefied gases or refrigerated liquefied oxygen, the maximum rate at which the portable tank may be filled must not exceed the liquid flow capacity of the primary pressure relief system rated at a pressure not exceeding 120 percent of the portable tank's design pressure. For portable tanks used for the transport of refrigerated liquefied helium and refrigerated liquefied atmospheric gas (except oxygen), the maximum rate at which the tank is filled must not exceed the liquid flow capacity of the pressure relief device rated at 130 percent of the portable tank's design pressure. Except for a portable tank containing refrigerated liquefied helium, a portable tank shall have an outage of at least two percent below the inlet of the pressure relief device or pressure control valve, under conditions of incipient opening, with the portable tank in a level attitude. No outage is required for helium. Browse special provision TP5
TP22	Lubricants for portable tank fittings (for example, gaskets, shut-off valves, flanges) must be oxygen compatible. Browse special provision TP22

(8) Packing Authorizations (§173.***)

(8A) Exceptions	320	see 49 CFR §173.320
(8B) Non-bulk	316	see 49 CFR §173.316
(8C) Bulk	318, 319	see 49 CFR §173.318, 319

(9) Quantity Limits

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

(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

51	see 49 CFR §176.84

Source: 49 CFR §176.84

(3) Hazard Class

2.2
Non-toxic, non-flammable gases

(4) Identification number

UN 1003

(5) Packing Group

n/a

Comparison View of PG

(6) Labels

(7) Special Provisions (§172.102)

T75	When portable tank instruction T75 is referenced in Column (7) of the § 172.101 Table, the applicable refrigerated liquefied gases are authorized to be transported in portable tanks in accordance with the requirements of § 178.277 of this subchapter. Browse special provision T75
TP5	For a portable tank used for the transport of flammable refrigerated liquefied gases or refrigerated liquefied oxygen, the maximum rate at which the portable tank may be filled must not exceed the liquid flow capacity of the primary pressure relief system rated at a pressure not exceeding 120 percent of the portable tank's design pressure. For portable tanks used for the transport of refrigerated liquefied helium and refrigerated liquefied atmospheric gas (except oxygen), the maximum rate at which the tank is filled must not exceed the liquid flow capacity of the pressure relief device rated at 130 percent of the portable tank's design pressure. Except for a portable tank containing refrigerated liquefied helium, a portable tank shall have an outage of at least two percent below the inlet of the pressure relief device or pressure control valve, under conditions of incipient opening, with the portable tank in a level attitude. No outage is required for helium. Browse special provision TP5
TP22	Lubricants for portable tank fittings (for example, gaskets, shut-off valves, flanges) must be oxygen compatible. Browse special provision TP22

(8) Packing Authorizations (§173.***)

(8A) Exceptions	320	see 49 CFR §173.320
(8B) Non-bulk	316	see 49 CFR §173.316
(8C) Bulk	318, 319	see 49 CFR §173.318, 319

(9) Quantity Limits

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

(10) Vessel stowage

(10A) Location

Source: 49 CFR §172.101(k)

(10B) Other

51	see 49 CFR §176.84

Source: 49 CFR §176.84

Packing group comparison

Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.

	PG n/a	PG n/a
1
2	Air, refrigerated liquid, (cryogenic liquid)	Air, refrigerated liquid, (cryogenic liquid) non-pressurized
3	2.2	2.2
4	UN 1003	UN 1003
5	n/a	n/a
6	2.2, 5.1	2.2, 5.1
7	T75, TP5, TP22	T75, TP5, TP22
8A	320	320
8B	316	316
8C	318, 319	318, 319
9A	Forbidden	Forbidden
9B	Forbidden	Forbidden
10A	D	D
10B	51	51

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 3168	Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquid	2.3
UN 3167	Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquid	2.1
UN 3169	Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquid	2.3
UN 3164	Articles, pressurized pneumatic or hydraulic containing non-flammable gas	2.2
	Accumulators, pressurized, pneumatic or hydraulic (containing non-flamable gas), see Articles pressurized, pneumatic or hydraulic (containing non-flamable gas)
NA 1057	Lighters, non-pressurized, containing flammable liquid,	3
NA 3334	Self-defense spray, non-pressurized	9