HazMat Tool — substance information

Refrigerating machines, containing flammable, non-toxic, liquefied gas

HMT May 2026

UN / ID: UN 3358
Hazard class: 2.1
Packing group: —
ERG guide: ERG 115
Special provisions: —
Source: 49 CFR §172 (2026/05)

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Refrigerating machines, containing flammable, non-toxic, liquefied gas

Emergency Response Guide No. 115

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.1
Flammable gases

(7) Special Provisions (§172.102)

(8) Packing Authorizations (§173.***)

(8A) Exceptions	306, 307	see 49 CFR §173.306, 307
(8B) Non-bulk	306	see 49 CFR §173.306
(8C) Bulk	306	see 49 CFR §173.306

(9) Quantity Limits

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

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 3138	Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene	2.1
UN 1973	Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 with fixed boiling point, with approximately 49 percent chlorodifluoromethane	2.2
UN 1972	Methane, refrigerated liquid (cryogenic liquid) or Natural gas, refrigerated liquid (cryogenic liquid, with high methane content)	2.1
UN 2857	Refrigerating machines, containing non-flammable, non-toxic gases, or ammonia solutions (UN2672)	2.2
UN 2599	Chlorotrifluoromethane and trifluoromethane azeotropic mixture or Refrigerant gas R 503 with approximately 60 percent chlorotrifluoromethane	2.2
UN 2602	Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane	2.2
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 3312	Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid)	2.1
UN 3311	Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid)	2.2
NA 1954	Refrigerant gases, n.o.s. or Dispersant gases, n.o.s.	2.1
UN 2035	1,1,1-Trifluoroethane or Refrigerant gas, R 143a	2.1
UN 1958	1,2-Dichloro-1,1,2,2- tetrafluoroethane or Refrigerant gas R 114	2.2
UN 1003	Air, refrigerated liquid, (cryogenic liquid) non-pressurized	2.2