HazMat Tool — substance information

Refrigerant gases, n.o.s. or Dispersant gases, n.o.s.

HMT May 2026

UN / ID: NA 1954
Hazard class: 2.1
Packing group: —
ERG guide: —
Special provisions: SP T50
Source: 49 CFR §172 (2026/05)

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Refrigerant gases, n.o.s. or Dispersant gases, n.o.s.

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.1
Flammable gases

This entry is signed with "D". The letter "D" identifies proper shipping names which are appropriate for describing materials for domestic transportation but may be inappropriate for international transportation under the provisions of international regulations (e.g., IMO, ICAO). An alternate proper shipping name may be selected when either domestic or international transportation is involved.

(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 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 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 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 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 1958	1,2-Dichloro-1,1,2,2- tetrafluoroethane or Refrigerant gas R 114	2.2
UN 1858	Hexafluoropropylene compressed or Refrigerant gas R 1216	2.2
UN 1063	Methyl chloride or Refrigerant gas R 40	2.1
UN 2454	Methyl fluoride, or Refrigerant gas R 41	2.1
UN 1082	Trifluorochloroethylene, stabilized or Refrigerant gas R 1113	2.3
UN 3358	Refrigerating machines, containing flammable, non-toxic, liquefied gas	2.1