HazMat Tool — substance information

Potassium phosphide

HMT May 2026
UN / ID
UN 2012
Hazard class
4.3
Packing group
I
ERG guide
ERG 139
Special provisions
SP A19, SP N40, SP W31
Source
49 CFR §172 (2026/05)

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Potassium phosphide


Potassium phosphide is an inorganic semiconductor compound with the formula K3P. It appears as a green crystalline solid or powder. It reacts violently with water (even on contact with air) and is toxic via ingestion, inhalation and skin absorption. It has a hexagonal structure. Wikipedia

Emergency Response Guide No. 139

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

4.3
Dangerous when wet materials

(4) Identification number Help

UN 2012

(5) Packing Group Help

I

(6) Labels Help

Dangerous when wet materials (4.3) Poisonous liquids PG I Zone A (6.1) Cargo Aircraft Only (Cargo Aircraft Only)

(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
N40
W31

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

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

(9) Quantity Limits Help

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

(10) Vessel stowage Help

(10A) Location
(10B) Other

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.