HazMat Tool — substance information

Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane

HMT May 2026

UN / ID: UN 2602
Hazard class: 2.2
Packing group: —
ERG guide: ERG 126
Special provisions: SP T50
Source: 49 CFR §172 (2026/05)

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Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane

Emergency Response Guide No. 126

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(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.

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	75 kg
(9B) Cargo aircraft only	150 kg

(10) Vessel stowage

(10A) Location	A Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel. Source: 49 CFR §172.101(k)
(10B) Other	n/a

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 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 3070	Ethylene oxide and dichlorodifluoromethane mixture, with not more than 12.5 percent ethylene oxide	2.2
UN 1018	Chlorodifluoromethane or Refrigerant gas R 22	2.2
UN 1022	Chlorotrifluoromethane or Refrigerant gas R 13	2.2
UN 1029	Dichlorofluoromethane or Refrigerant gas R21	2.2
UN 1009	Bromotrifluoromethane or Refrigerant gas, R 13B1.	2.2
UN 1028	Dichlorodifluoromethane or Refrigerant gas R 12	2.2
UN 3252	Difluoromethane or Refrigerant gas R 32	2.1
UN 1982	Tetrafluoromethane or Refrigerant gas R 14	2.2
UN 1984	Trifluoromethane or Refrigerant gas R 23	2.2
UN 3136	Trifluoromethane, refrigerated liquid	2.2
UN 1941	Dibromodifluoromethane, R12B2	9
	R 502, see Chlorodifluoromethane and chloropentafluoroethane mixture, etc

Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane

Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane

Hazardous Materials Table

(3) Hazard Class

(4) Identification number

(5) Packing Group

(6) Labels

(7) Special Provisions (§172.102)

(8) Packing Authorizations (§173.***)

(9) Quantity Limits

(10) Vessel stowage

Segregation chart for load, transport, and storage

Similar substances