HazMat Tool — substance information

1-Hydroxybenzotriazole, anhydrous, dry or wetted with less than 20 percent water, by mass

HMT 15 June 2026

UN / ID: UN 0508
Hazard class: 1.3C
Packing group: —
ERG guide: —
Special provisions: —
Source: 49 CFR §172 (15 June 2026)

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1-Hydroxybenzotriazole, anhydrous, dry or wetted with less than 20 percent water, by mass

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

1.3
Explosives

Compatibility group of explosives - Description of substances or article to be classified

Group: C

Propellant explosive substance or other deflagrating explosive substance or article containing such explosive substance.

Source: 49 CFR §173.52

(7) Special Provisions (§172.102)

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	62	see 49 CFR §173.62
(8C) Bulk	None

(9) Quantity Limits

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

Stowage category “04” means the material may be stowed “on deck” in closed cargo transport units or “under deck” in closed cargo transports on a cargo vessel (up to 12 passengers) but the material is prohibited on a passenger vessel.

Source: 49 CFR §172.101(k)

(10B) Other

25	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 3474	1-Hydroxybenzotriazole, monohydrate	4.1