HazMat Tool — substance information

Calcium silicide

HMT May 2026
UN / ID
UN 1405
Hazard class
4.3
Packing group
II (multiple — see tabs)
ERG guide
ERG 138
Special provisions
SP A19, SP IB7, SP IP2, SP IP21, SP T3, SP TP33, SP W31
Source
49 CFR §172 (2026/05)

Spot an error in this entry?

Calcium silicide


Calcium silicide may refer to Dicalcium monosilicide, Ca2Si Calcium monosilicide, CaSi Calcium disilicide, CaSi2 Wikipedia

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 1405

(5) Packing Group Help

II

(6) Labels Help

Dangerous when wet materials (4.3)

(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
IB7
IP2
IP21
T3
TP33
W31

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

(8A) Exceptions151see 49 CFR §173.151
(8B) Non-bulk212see 49 CFR §173.212
(8C) Bulk241see 49 CFR §173.241

(9) Quantity Limits Help

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

(10) Vessel stowage Help

(10A) Location
(10B) Other

(3) Hazard Class

4.3
Dangerous when wet materials

(4) Identification number Help

UN 1405

(5) Packing Group Help

III

(6) Labels Help

Dangerous when wet materials (4.3)

(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.
A1
A19
IB8
IP21
T1
TP33
W31

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

(8A) Exceptions151see 49 CFR §173.151
(8B) Non-bulk213see 49 CFR §173.213
(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 II PG III
1
2Calcium silicideCalcium silicide
34.34.3
4UN 1405UN 1405
5IIIII
64.34.3
7A19, IB7, IP2, IP21, T3, TP33, W31A1, A19, IB8, IP21, T1, TP33, W31
8A151151
8B212213
8C241241
9A15 kg25 kg
9B50 kg100 kg
10ABB
10B13, 52, 85, 103, 14813, 52, 85, 103, 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 2624Magnesium silicide4.3