HazMat Tool — substance information

Ethyl fluoride or Refrigerant gas R161

HMT 15 June 2026

UN / ID: UN 2453
Hazard class: 2.1
Packing group: —
ERG guide: ERG 115
Special provisions: —
Source: 49 CFR §172 (15 June 2026)

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Ethyl fluoride or Refrigerant gas R161

Emergency Response Guide No. 115

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.1
Flammable gases

(7) Special Provisions (§172.102)

(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

Stowage category “E” means the material may be stowed “on deck” or “under deck” 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 is prohibited from carriage 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 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 2454	Methyl fluoride, or Refrigerant gas R 41	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 1063	Methyl chloride or Refrigerant gas R 40	2.1
UN 1082	Trifluorochloroethylene, stabilized or Refrigerant gas R 1113	2.3
NA 1954	Refrigerant gases, n.o.s. or Dispersant gases, n.o.s.	2.1
UN 1959	1,1-Difluoroethylene or Refrigerant gas R 1132a	2.1
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