HazMat Tool — substance information

Germane, adsorbed

HMT 15 June 2026

UN / ID: UN 3523
Hazard class: 2.3
Packing group: —
ERG guide: ERG 173
Special provisions: SP 2
Source: 49 CFR §172 (15 June 2026)

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Germane, adsorbed

Germane is the chemical compound with the formula GeH4, and the germanium analogue of methane. It is the simplest germanium hydride and one of the most useful compounds of germanium. Like the related compounds silane and methane, germane is tetrahedral. It burns in air to produce GeO2 and water Wikipedia

Emergency Response Guide No. 173

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.3
Poisonous gas

(4) Identification number

UN 3523

(5) Packing Group

n/a

(6) Labels

(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.

2	This material is poisonous by inhalation (see § 171.8 of this subchapter) in Hazard Zone B (see § 173.116(a) or § 173.133(a) of this subchapter), and must be described as an inhalation hazard under the provisions of this subchapter. Browse special provision 2

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	302c	see 49 CFR §173.302c
(8C) Bulk	None

(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

40	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.

Note: In this segregation and separation chart are HazMat of hazard class 2.3 considered depending on their poisonousness by inhalation (Hazard zone B). See special provision 2 and PHMSA Interpretation #09-0252.

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 3517	Adsorbed gas, toxic, flammable, corrosive, n.o.s. Inhalation hazard zone A	2.3
UN 3517	Adsorbed gas, toxic, flammable, corrosive, n.o.s. Inhalation hazard zone B	2.3
UN 3517	Adsorbed gas, toxic, flammable, corrosive, n.o.s. Inhalation hazard zone C	2.3
UN 3517	Adsorbed gas, toxic, flammable, corrosive, n.o.s. Inhalation hazard zone D	2.3
UN 3518	Adsorbed gas, toxic, oxidizing, corrosive, n.o.s. Inhalation hazard zone A	2.3
UN 3518	Adsorbed gas, toxic, oxidizing, corrosive, n.o.s. Inhalation hazard zone B	2.3
UN 3518	Adsorbed gas, toxic, oxidizing, corrosive, n.o.s. Inhalation hazard zone C	2.3
UN 3518	Adsorbed gas, toxic, oxidizing, corrosive, n.o.s. Inhalation hazard zone D	2.3
UN 3516	Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone A	2.3
UN 3516	Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone B	2.3
UN 3516	Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone C	2.3
UN 3516	Adsorbed gas, toxic, corrosive, n.o.s. Inhalation hazard zone D	2.3
UN 3514	Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone A	2.3
UN 3514	Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone B	2.3
UN 3514	Adsorbed gas, toxic, flammable, n.o.s. Inhalation hazard zone C	2.3