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Perchloric acid with more than 50 percent but not more than 72 percent acid, by mass

HMT 15 June 2026

UN / ID: UN 1873
Hazard class: 5.1
Packing group: I
ERG guide: ERG 143
Special provisions: SP A2, SP N41, SP T10, SP TP1
Source: 49 CFR §172 (15 June 2026)

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Perchloric acid with more than 50 percent but not more than 72 percent acid, by mass

Substance Data

Source: PubChem

CAS-Number

7601-90-3

Flash Point

—

Boiling Point

—

Emergency Response Guide No. 143

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard class

5.1
Oxidizers

(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.

Single packagings are not permitted on aircraft.

Browse special provision A2

N41

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

Browse special provision N41

T10

Minimum test pressure (bar)	4
Minimum shell thickness	6 mm
Pressure-relief requirements	§ 178.275(g)(3)
Bottom opening requirements	Prohibited

Browse special provision T10

TP1

The maximum degree of filling must not exceed the degree of filling determined by the following:
TP1

Where:
t_r is the maximum mean bulk temperature during transport, and t_f is the temperature in degrees celsius of the liquid during filling.

Browse special provision TP1

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	201	see 49 CFR §173.201
(8C) Bulk	243	see 49 CFR §173.243

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	2.5 L

(10) Vessel stowage

(10A) Location

Stowage category “D” means the material must be stowed “on deck only” 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 the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

53	see 49 CFR §176.84
58	see 49 CFR §176.84
66	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 1802	Perchloric acid with not more than 50 percent acid by mass	8
	Perchloric acid, with more than 72 percent acid by mass	Forbidden
UN 3211	Perchlorates, inorganic, aqueous solution, n.o.s.	5.1
UN 1447	Barium perchlorate, solid	5.1
UN 3406	Barium perchlorate, solution	5.1
	Diazonium perchlorates (dry)	Forbidden
	Ethylene diamine diperchlorate	Forbidden
UN 1470	Lead perchlorate, solid	5.1
UN 3408	Lead perchlorate, solution	5.1
	m-Nitrobenzene diazonium perchlorate	Forbidden
	m-Phenylene diaminediperchlorate (dry)	Forbidden
	Methylamine perchlorate (dry)	Forbidden
UN 1481	Perchlorates, inorganic, n.o.s.	5.1
	Tetraethylammonium perchlorate (dry)	Forbidden
	Trimethylene glycol diperchlorate	Forbidden