HazMat Tool — substance information

Pyrophoric liquid, inorganic, n.o.s

HMT May 2026

UN / ID: UN 3194
Hazard class: 4.2
Packing group: I
ERG guide: ERG 135
Special provisions: —
Source: 49 CFR §172 (2026/05)

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Pyrophoric liquid, inorganic, n.o.s

Emergency Response Guide No. 135

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(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)

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	181	see 49 CFR §173.181
(8C) Bulk	244	see 49 CFR §173.244

(9) Quantity Limits

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

(10) Vessel stowage

(10A) Location

Stowage category “D” means the material must be stowed “on deck only” 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 the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

13	see 49 CFR §176.84
78	see 49 CFR §176.84
148	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
NA 2845	Ethyl phosphonous dichloride, anhydrous pyrophoric liquid	6.1
UN 2441	Titanium trichloride, pyrophoric or Titanium trichloride mixtures, pyrophoric	4.2
NA 2845	Methyl phosphonous dichloride, pyrophoric liquid	6.1
UN 3394	Organometallic substance, liquid, pyrophoric, water-reactive	4.2
UN 3393	Organometallic substance, solid, pyrophoric, water-reactive	4.2
UN 1855	Calcium, pyrophoric or Calcium alloys, pyrophoric	4.2
UN 1383	Pyrophoric metals, n.o.s., or Pyrophoric alloys, n.o.s	4.2
UN 3392	Organometallic substance, liquid, pyrophoric	4.2
UN 2845	Pyrophoric liquids, organic, n.o.s	4.2
UN 3391	Organometallic substance, solid, pyrophoric	4.2
UN 1854	Barium alloys, pyrophoric	4.2
UN 2846	Pyrophoric solids, organic, n.o.s	4.2
UN 0380	Articles, pyrophoric	1.2L
UN 3200	Pyrophoric solid, inorganic, n.o.s	4.2