HazMat Tool — substance information

Self-heating liquid, toxic, organic, n.o.s

HMT May 2026

UN / ID: UN 3184
Hazard class: 4.2
Packing group: II (multiple — see tabs)
ERG guide: ERG 136
Special provisions: SP IB2, SP W31
Source: 49 CFR §172 (2026/05)

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Self-heating liquid, toxic, organic, n.o.s

Emergency Response Guide No. 136

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

Packing group II
Packing group III

(3) Hazard Class

4.2
Spontaneously combustible materials

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.

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
W31	Non-bulk packagings must be hermetically sealed. Browse special provision W31

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(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

(3) Hazard Class

4.2
Spontaneously combustible materials

(4) Identification number

UN 3184

(5) Packing Group

III

Comparison View of PG

(6) Labels

Spontaneously combustible materials (4.2)

(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
W31	Non-bulk packagings must be hermetically sealed. Browse special provision W31

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	203	see 49 CFR §173.203
(8C) Bulk	241	see 49 CFR §173.241

(9) Quantity Limits

(9A) Passenger aircraft/rail	5 L
(9B) Cargo aircraft only	60 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 II	PG III
1	G	G
2	Self-heating liquid, toxic, organic, n.o.s	Self-heating liquid, toxic, organic, n.o.s
3	4.2	4.2
4	UN 3184	UN 3184
5	II	III
6	4.2, 6.1	4.2, 6.1
7	IB2, W31	IB2, W31
8A	None	None
8B	202	203
8C	243	241
9A	1 L	5 L
9B	5 L	60 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.

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 2793	Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating	4.2
UN 2968	Maneb stabilized or Maneb preparations, stabilized against self-heating	4.3
UN 3206	Alkali metal alcoholates, self-heating, corrosive, n.o.s.	4.2
UN 3124	Toxic solids, self-heating, n.o.s.	6.1
UN 3191	Self-heating solid, toxic, inorganic, n.o.s.	4.2
UN 3209	Metallic substance, water-reactive, self-heating, n.o.s	4.3
UN 3397	Organometallic substance, solid, water-reactive, self-heating	4.3
UN 3100	Oxidizing solid, self-heating, n.o.s.	5.1
UN 2006	Plastics, nitrocellulose-based, self-heating, n.o.s.	4.2
UN 3192	Self-heating solid, corrosive, inorganic, n.o.s.	4.2
UN 3135	Water-reactive solid, self-heating, n.o.s.	4.3
UN 3187	Self-heating liquid, toxic, inorganic, n.o.s	4.2
UN 3301	Corrosive liquid, self-heating, n.o.s	8
UN 3188	Self-heating liquid, corrosive, inorganic, n.o.s	4.2
UN 3095	Corrosive solids, self-heating, n.o.s	8