HazMat Tool — substance information

Metal hydrides, water reactive, n.o.s

HMT May 2026
UN / ID
UN 1409
Hazard class
4.3
Packing group
I (multiple — see tabs)
ERG guide
ERG 138
Special provisions
SP A19, SP N34, SP N40, SP W31
Source
49 CFR §172 (2026/05)

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Metal hydrides, water reactive, n.o.s

Emergency Response Guide No. 138

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

4.3
Dangerous when wet materials

(4) Identification number Help

UN 1409

(5) Packing Group Help

I

(6) Labels Help

Dangerous when wet materials (4.3) Cargo Aircraft Only (Cargo Aircraft Only)

(1) Symbols Help


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) Help

×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.
A19
N34
N40
W31

(8) Packing Authorizations (§173.***) Help

(8A) ExceptionsNone
(8B) Non-bulk211see 49 CFR §173.211
(8C) Bulk242see 49 CFR §173.242

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft only15 kg

(10) Vessel stowage Help

(10A) Location
(10B) Other

(3) Hazard Class

4.3
Dangerous when wet materials

(4) Identification number Help

UN 1409

(5) Packing Group Help

II

(6) Labels Help

Dangerous when wet materials (4.3)

(1) Symbols Help


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) Help

×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.
A19
IB4
N34
N40
T3
TP33
W31
W40

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions151see 49 CFR §173.151
(8B) Non-bulk212see 49 CFR §173.212
(8C) Bulk242see 49 CFR §173.242

(9) Quantity Limits Help

(9A) Passenger aircraft/rail15 kg
(9B) Cargo aircraft only50 kg

(10) Vessel stowage Help

(10A) Location
(10B) Other

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 I PG II
1GG
2Metal hydrides, water reactive, n.o.sMetal hydrides, water reactive, n.o.s
34.34.3
4UN 1409UN 1409
5III
64.34.3
7A19, N34, N40, W31A19, IB4, N34, N40, T3, TP33, W31, W40
8ANone151
8B211212
8C242242
9AForbidden15 kg
9B15 kg50 kg
10ADD
10B13, 52, 14813, 52, 148

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.

Prohibited Must not be loaded, transported, or stored together in the same vehicle or facility.
Permitted May be loaded, transported, or stored together.
Restricted May be loaded, transported, or stored together only with restrictions.

Similar substances

UN / IDProper shipping nameHazard class
UN 2698Tetrahydrophthalic anhydrides with more than 0.05 percent of maleic anhydride8
UN 3182Metal hydrides, flammable, n.o.s4.1