HazMat Tool — substance information

Magnesium perchlorate

HMT 15 June 2026

UN / ID: UN 1475
Hazard class: 5.1
Packing group: II
ERG guide: ERG 140
Special provisions: SP IB6, SP IP2, SP T3, SP TP33
Source: 49 CFR §172 (15 June 2026)

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Magnesium perchlorate

Magnesium perchlorate is a powerful oxidizing agent, with the formula Mg(ClO4)2. The salt is also a superior drying agent for gas analysis. Magnesium perchlorate decomposes at 250 °C. The heat of formation is -568.90 kJ/mol. Magnesium perchlorate is very soluble in water (99.3 g/100 mL at room temperature), and because of this the freezing point depression can be quite high, with the eutectic point at −64 °C (−83 °F). It is sold under the trade name Anhydrone. Manufacture of this product on a semi-industrial scale was first performed by G Wikipedia

Substance Data

Source: PubChem (HSDB, 03.12.2019)

CAS-Number

10034-81-8

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 140

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

5.1
Oxidizers

(4) Identification number

UN 1475

(5) Packing Group

(6) Labels

(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.

IB6

_{Authorized IBCs:} Metal (11A, 11B, 11N, 21A, 21B, 21N, 31A, 31B and 31N); Rigid plastics (11H1, 11H2, 21H1, 21H2, 31H1 and 31H2); Composite (11HZ1, 11HZ2, 21HZ1, 21HZ2 and 31HZ1).
_{Additional Requirement:} Composite IBCs 11HZ2 and 21HZ2 may not be used when the hazardous materials being transported may become liquid during transport.

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IP2

When IBCs other than metal or rigid plastics IBCs are used, they must be offered for transportation in a closed freight container or a closed transport vehicle.

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Minimum test pressure (bar)	2.65
Minimum shell thickness	§ 178.274(d)(2)
Pressure-relief requirements	Normal
Bottom opening requirements	§ 178.275(d)(2)

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TP33

The portable tank instruction assigned for this substance applies for granular and powdered solids and for solids which are filled and discharged at temperatures above their melting point which are cooled and transported as a solid mass. Solid substances transported or offered for transport above their melting point are authorized for transportation in portable tanks conforming to the provisions of portable tank instruction T4 for solid substances of packing group III or T7 for solid substances of packing group II, unless a tank with more stringent requirements for minimum shell thickness, maximum allowable working pressure, pressure-relief devices or bottom outlets are assigned in which case the more stringent tank instruction and special provisions shall apply. Filling limits must be in accordance with portable tank special provision TP3. Solids meeting the definition of an elevated temperature material must be transported in accordance with the applicable requirements of this subchapter.

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(8) Packing Authorizations (§173.***)

(8A) Exceptions	152	see 49 CFR §173.152
(8B) Non-bulk	212	see 49 CFR §173.212
(8C) Bulk	242	see 49 CFR §173.242

(9) Quantity Limits

(9A) Passenger aircraft/rail	5 kg
(9B) Cargo aircraft only	25 kg

(10) Vessel stowage

(10A) Location

Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel.

Source: 49 CFR §172.101(k)

(10B) Other

56	see 49 CFR §176.84
58	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 1869	Magnesium or Magnesium alloys with more than 50 percent magnesium in pellets, turnings or ribbons	4.1
UN 2950	Magnesium granules, coated, particle size not less than 149 microns	4.3
UN 1459	Chlorate and magnesium chloride mixture solid	5.1
UN 3407	Chlorate and magnesium chloride mixture solution	5.1
UN 1418	Magnesium, powder or Magnesium alloys, powder	4.3
UN 1928	Methyl magnesium bromide, in ethyl ether	4.3
	Magnesium dross, wet or hot	Forbidden
UN 1419	Magnesium aluminum phosphide	4.3
UN 1622	Magnesium arsenate	6.1
UN 1473	Magnesium bromate	5.1
UN 2723	Magnesium chlorate	5.1
UN 2004	Magnesium diamide	4.2
UN 2853	Magnesium fluorosilicate	6.1
UN 2010	Magnesium hydride	4.3
UN 1474	Magnesium nitrate	5.1