HazMat Tool — substance information

Barium azide, wetted with not less than 50 percent water, by mass

HMT 15 June 2026

UN / ID: UN 1571
Hazard class: 4.1
Packing group: I
ERG guide: ERG 113
Special provisions: SP 162, SP A2, SP W31
Source: 49 CFR §172 (15 June 2026)

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Barium azide, wetted with not less than 50 percent water, by mass

Barium azide is an inorganic azide with the formula Ba(N3)2. It is a barium salt of hydrazoic acid. Like all azides, it is explosive. It is less sensitive to mechanical shock than lead azide Wikipedia

Emergency Response Guide No. 113

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

4.1
Flammable solids

(4) Identification number

UN 1571

(5) Packing Group

(6) Labels

Cargo Aircraft Only (Cargo Aircraft Only)

(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.

162	This material may be transported under the provisions of Division 4.1 only if it is packed so that at no time during transport will the percentage of diluent fall below the percentage that is stated in the shipping description. Browse special provision 162
A2	Single packagings are not permitted on aircraft. Browse special provision A2
W31	Non-bulk packagings must be hermetically sealed. Browse special provision W31

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	182	see 49 CFR §173.182
(8C) Bulk	None

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	0.5 kg

(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

28	see 49 CFR §176.84
36	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
UN 0224	Barium azide, dry or wetted with less than 50 percent water, by mass	1.1A
UN 2741	Barium hypochlorite with more than 22 percent available chlorine	5.1
UN 1854	Barium alloys, pyrophoric	4.2
UN 1445	Barium chlorate, solid	5.1
UN 3405	Barium chlorate, solution	5.1
UN 1564	Barium compounds, n.o.s	6.1
UN 1447	Barium perchlorate, solid	5.1
UN 3406	Barium perchlorate, solution	5.1