HazMat Tool — substance information

Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide

HMT May 2026

UN / ID: UN 1952
Hazard class: 2.2
Packing group: —
ERG guide: ERG 126
Special provisions: —
Source: 49 CFR §172 (2026/05)

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Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide

Emergency Response Guide No. 126

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

2.2
Non-toxic, non-flammable gases

(4) Identification number

UN 1952

(5) Packing Group

n/a

(6) Labels

(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	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.

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UN / ID	Proper shipping name	Hazard class
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UN 0075	Diethyleneglycol dinitrate, desensitized with not less than 25 percent non-volatile water-insoluble phlegmatizer, by mass	1.1D
UN 0484	Cyclotetramethylenetetranitramine, desensitized or Octogen, desensitized or HMX, desensitized	1.1D
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UN 1959	1,1-Difluoroethylene or Refrigerant gas R 1132a	2.1
	Cyclotetramethylene tetranitramine (dry or unphlegmatized) (HMX)	Forbidden
UN 3300	Ethylene oxide and carbon dioxide mixture with more than 87 percent ethylene oxide	2.3
UN 1041	Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide	2.1
UN 3297	Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide	2.2
UN 3070	Ethylene oxide and dichlorodifluoromethane mixture, with not more than 12.5 percent ethylene oxide	2.2
UN 3298	Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide	2.2