HazMat Tool — substance information

Metal catalyst, dry

HMT May 2026
UN / ID
UN 2881
Hazard class
4.2
Packing group
I (multiple — see tabs)
ERG guide
ERG 135
Special provisions
SP N34, SP T21, SP TP7, SP TP33, SP W31
Source
49 CFR §172 (2026/05)

Spot an error in this entry?

Metal catalyst, dry

Emergency Response Guide No. 135

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

4.2
Spontaneously combustible materials

(4) Identification number Help

UN 2881

(5) Packing Group Help

I

(6) Labels Help

Spontaneously combustible materials (4.2)

(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.
N34
T21
TP7
TP33
W31

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

(8A) ExceptionsNone
(8B) Non-bulk187see 49 CFR §173.187
(8C) BulkNone

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft onlyForbidden

(10) Vessel stowage Help

(10A) Location
(10B) Other

(3) Hazard Class

4.2
Spontaneously combustible materials

(4) Identification number Help

UN 2881

(5) Packing Group Help

II

(6) Labels Help

Spontaneously combustible materials (4.2) 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.
IB6
IP2
N34
T3
TP33
W31

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

(8A) ExceptionsNone
(8B) Non-bulk187see 49 CFR §173.187
(8C) Bulk242see 49 CFR §173.242

(9) Quantity Limits Help

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

(10) Vessel stowage Help

(10A) Location
(10B) Other

(3) Hazard Class

4.2
Spontaneously combustible materials

(4) Identification number Help

UN 2881

(5) Packing Group Help

III

(6) Labels Help

Spontaneously combustible materials (4.2)

(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.
B135
IB8
IP21
N34
T1
TP33
W31

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

(8A) ExceptionsNone
(8B) Non-bulk187see 49 CFR §173.187
(8C) Bulk241see 49 CFR §173.241

(9) Quantity Limits Help

(9A) Passenger aircraft/rail25 kg
(9B) Cargo aircraft only100 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 PG III
1GGG
2Metal catalyst, dryMetal catalyst, dryMetal catalyst, dry
34.24.24.2
4UN 2881UN 2881UN 2881
5IIIIII
64.24.24.2
7N34, T21, TP7, TP33, W31IB6, IP2, N34, T3, TP33, W31B135, IB8, IP21, N34, T1, TP33, W31
8ANoneNoneNone
8B187187187
8CNone242241
9AForbiddenForbidden25 kg
9BForbidden50 kg100 kg
10ACCC
10B13, 147, 14813, 147, 14813, 147, 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 1378Metal catalyst, wetted with a visible excess of liquid4.2