HazMat Tool — substance information

Perchlorates, inorganic, aqueous solution, n.o.s.

HMT May 2026

UN / ID: UN 3211
Hazard class: 5.1
Packing group: II (multiple — see tabs)
ERG guide: ERG 140
Special provisions: SP IB2, SP T4, SP TP1
Source: 49 CFR §172 (2026/05)

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Perchlorates, inorganic, aqueous solution, n.o.s.

Emergency Response Guide No. 140

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

Packing group II
Packing group III

(3) Hazard Class

(4) Identification number

UN 3211

(5) Packing Group

II

Comparison View of PG

(6) Labels

Oxidizers (5.1)

(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.

Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1).
Additional Requirement: Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized.

Browse special provision IB2

Minimum test pressure (bar)	2.65
Minimum shell thickness	§ 178.274(d)(2)
Pressure-relief requirements	Normal
Bottom opening requirements	§ 178.275(d)(3)

Browse special provision T4

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

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	152	see 49 CFR §173.152
(8B) Non-bulk	202	see 49 CFR §173.202
(8C) Bulk	242	see 49 CFR §173.242

(9) Quantity Limits

(9A) Passenger aircraft/rail	1 L
(9B) Cargo aircraft only	5 L

(10) Vessel stowage

(10A) Location

B

Stowage category “B” means

(i) The material may be stowed “on deck” or “under deck” on a cargo vessel and 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; and
(ii) “On deck only” on passenger vessels in which the number of passengers specified in paragraph (k)(2)(i) of this section is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

56	see 49 CFR §176.84
58	see 49 CFR §176.84
133	see 49 CFR §176.84

Source: 49 CFR §176.84

(3) Hazard Class

(4) Identification number

UN 3211

(5) Packing Group

III

Comparison View of PG

(6) Labels

Oxidizers (5.1)

(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.

Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1).
Additional Requirement: Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized.

Browse special provision IB2

Minimum test pressure (bar)	2.65
Minimum shell thickness	§ 178.274(d)(2)
Pressure-relief requirements	Normal
Bottom opening requirements	§ 178.275(d)(3)

Browse special provision T4

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

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	152	see 49 CFR §173.152
(8B) Non-bulk	202	see 49 CFR §173.202
(8C) Bulk	241	see 49 CFR §173.241

(9) Quantity Limits

(9A) Passenger aircraft/rail	2.5 L
(9B) Cargo aircraft only	30 L

(10) Vessel stowage

(10A) Location

B

Stowage category “B” means

(i) The material may be stowed “on deck” or “under deck” on a cargo vessel and 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; and
(ii) “On deck only” on passenger vessels in which the number of passengers specified in paragraph (k)(2)(i) of this section is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

56	see 49 CFR §176.84
58	see 49 CFR §176.84
69	see 49 CFR §176.84
133	see 49 CFR §176.84

Source: 49 CFR §176.84

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
2	Perchlorates, inorganic, aqueous solution, n.o.s.	Perchlorates, inorganic, aqueous solution, n.o.s.
3	5.1	5.1
4	UN 3211	UN 3211
5	II	III
6	5.1	5.1
7	IB2, T4, TP1	IB2, T4, TP1
8A	152	152
8B	202	202
8C	242	241
9A	1 L	2.5 L
9B	5 L	30 L
10A	B	B
10B	56, 58, 133	56, 58, 69, 133

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.

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