HazMat Tool — substance information

Toxic liquids, oxidizing, n.o.s.

HMT May 2026

UN / ID: UN 3122
Hazard class: 6.1
Packing group: I (multiple — see tabs)
ERG guide: ERG 142
Special provisions: SP A4
Source: 49 CFR §172 (2026/05)

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Toxic liquids, oxidizing, n.o.s.

Toxic or poisonous material is a material, other than a gas, known to be so toxic to humans that it presents a health hazard during transportation. More Information

Emergency Response Guide No. 142

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

Packing group I
Packing group II

(3) Hazard Class

6.1
Poisonous Material

This entry is signed with "G". The letter "G" identifies proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses, in association with the basic description. (See §172.203(k)).

(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.

A4	Liquids having an inhalation toxicity of Packing Group I are not permitted on aircraft. Browse special provision A4

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	201	see 49 CFR §173.201
(8C) Bulk	243	see 49 CFR §173.243

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	2.5 L

(10) Vessel stowage

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

(3) Hazard Class

6.1
Poisonous Material

(4) Identification number

UN 3122

(5) Packing Group

Comparison View of PG

(6) Labels

(1) Symbols

(7) Special Provisions (§172.102)

IB2	Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1). Additional Requirement: Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized. Browse special provision IB2

(8) Packing Authorizations (§173.***)

(8A) Exceptions	153	see 49 CFR §173.153
(8B) Non-bulk	202	see 49 CFR §173.202
(8C) Bulk	243	see 49 CFR §173.243

(9) Quantity Limits

(9A) Passenger aircraft/rail	1 L
(9B) Cargo aircraft only	5 L

(10) Vessel stowage

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

Packing group comparison

Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.

	PG I	PG II
1	G	G
2	Toxic liquids, oxidizing, n.o.s.	Toxic liquids, oxidizing, n.o.s.
3	6.1	6.1
4	UN 3122	UN 3122
5	I	II
6	6.1, 5.1	6.1, 5.1
7	A4	IB2
8A	None	153
8B	201	202
8C	243	243
9A	Forbidden	1 L
9B	2.5 L	5 L
10A	C	C
10B	n/a	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.

Note: The HMR prohibit only those Division 6.1 liquids that meet the definition of a Packing Group (PG) I and Hazard Zone A. See special provision 1 and PHMSA Interpretation #09-0252.

Packages with POISON or POISON INHALATION HAZARD labels, or a POISON label displaying “PG III,” or “PG III” marked next to a POISON label may not be transported with foodstuffs, feed or any other edible material, intended for humans or animals. For exceptions see 49 CFR §177.841(e).

Scope & sources (important)Click to show CFR references

This check evaluates segregation per 49 CFR §177.848. Additional loading/unloading and handling requirements may still apply; see 49 CFR §177 Subpart B (Loading and Unloading):

§177.834 - General requirements
§177.835 - Class 1 materials
§177.837 - Class 3 materials
§177.838 - Class 4 (flammable solid) materials, Class 5 (oxidizing) materials, and Division 4.2 (pyroforic liquid) materials
§177.839 - Class 8 (corrosive) materials
§177.840 - Class 2 (gases) materials
§177.841 - Division 6.1 and Division 2.3 materials
§177.842 - Class 7 (radioactive) material
§177.843 - Contamination of vehicles

Similar substances

UN / ID	Proper shipping name	Hazard class
UN 3473	Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment, containing flammable liquids	3
UN 0250	Rocket motors with hypergolic liquids with or without an expelling charge	1.3L
UN 0322	Rocket motors with hypergolic liquids with or without an expelling charge	1.2L
UN 2591	Xenon, refrigerated liquid (cryogenic liquids)	2.2
UN 2922	Corrosive liquids, toxic, n.o.s.	8
UN 1992	Flammable liquids, toxic, n.o.s.	3
UN 2927	Toxic liquids, corrosive, organic, n.o.s.	6.1
UN 2929	Toxic liquids, flammable, organic, n.o.s.	6.1
UN 3123	Toxic liquids, water-reactive, n.o.s	6.1
UN 2810	Toxic, liquids, organic, n.o.s.	6.1
UN 3094	Corrosive liquids, water-reactive, n.o.s	8
UN 2845	Pyrophoric liquids, organic, n.o.s	4.2
UN 3093	Corrosive liquids, oxidizing, n.o.s.	8
UN 1719	Caustic alkali liquids, n.o.s.	8
UN 2920	Corrosive liquids, flammable, n.o.s.	8