HazMat Tool — substance information

Potassium sodium alloys, liquid

HMT 15 June 2026

UN / ID: UN 1422
Hazard class: 4.3
Packing group: I
ERG guide: ERG 138
Special provisions: SP A7, SP A19, SP B27, SP N34, SP N40, SP T9, SP TP3, SP TP7, more…
Source: 49 CFR §172 (15 June 2026)

Spot an error in this entry?

On this page

Potassium sodium alloys, liquid

Emergency Response Guide No. 138

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

4.3
Dangerous when wet materials

(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.

Steel packagings must be corrosion-resistant or have protection against corrosion.

Browse special provision A7

A19

Combination packagings consisting of outer fiber drums or plywood drums, with inner plastic packagings, are not authorized for transportation by aircraft.

Browse special provision A19

B27

Tanks must have a service pressure of 1,034 kPa (150 psig). Tank car tanks must have a test pressure rating of 1,379 kPa (200 psig). Lading must be blanketed at all times with a dry inert gas at a pressure not to exceed 103 kPa (15 psig).

Browse special provision B27

N34

Aluminum construction materials are not authorized for any part of a packaging which is normally in contact with the hazardous material.

Browse special provision N34

N40

This material is not authorized in the following packagings:
a. A combination packaging consisting of a 4G fiberboard box with inner receptacles of glass or earthenware;
b. A single packaging of a 4C2 sift-proof, natural wood box; or
c. A composite packaging 6PG2 (glass, porcelain or stoneware receptacles within a fiberboard box).

Browse special provision N40

Minimum test pressure (bar)	4
Minimum shell thickness	6 mm
Pressure-relief requirements	Normal
Bottom opening requirements	Prohibited for liquids.

Browse special provision T9

TP3

The maximum degree of filling (in %) for solids transported above their melting points and for elevated temperature liquids shall be determined by the following:
TP3

Where: d_f and d_r are the mean densities of the liquid at the mean temperature of the liquid during filling and the maximum mean bulk temperature during transport respectively.

Browse special provision TP3

TP7

The vapor space must be purged of air by nitrogen or other means.

Browse special provision TP7

TP31

This hazardous material may only be transported in tanks in the solid state.

Browse special provision TP31

W31

Non-bulk packagings must be hermetically sealed.

Browse special provision W31

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	201	see 49 CFR §173.201
(8C) Bulk	244	see 49 CFR §173.244

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	1 L

(10) Vessel stowage

(10A) Location

Stowage category “E” means the material may be stowed “on deck” or “under deck” 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 is prohibited from carriage on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

13	see 49 CFR §176.84
40	see 49 CFR §176.84
52	see 49 CFR §176.84
148	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.

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 1382	Potassium sulfide, anhydrous or Potassium sulfide with less than 30 percent water of crystallization	4.2
UN 1847	Potassium sulfide, hydrated with not less than 30 percent water of crystallization	8
UN 3028	Batteries, dry, containing potassium hydroxide solid, electric storage	8
UN 1420	Potassium, metal alloys, liquid	4.3
UN 3403	Potassium, metal alloys, solid	4.3
UN 1487	Potassium nitrate and sodium nitrite mixtures	5.1
UN 1499	Sodium nitrate and potassium nitrate mixtures	5.1
UN 2427	Potassium chlorate, aqueous solution	5.1
	Potassium dichloro isocyanurate or Potassium dichloro-s-triazinetrione, see Dichloroisocyanuric acid, dry or Dichloroisocyanuric acid salts etc
UN 1929	Potassium dithionite or Potassium hydrosulfite	4.2
UN 3404	Potassium sodium alloys, solid	4.3
UN 1551	Antimony potassium tartrate	6.1
UN 1626	Mercuric potassium cyanide	6.1
UN 1643	Mercury potassium iodide	6.1
UN 3413	Potassium cyanide solution	6.1