UN 2626

CHLORIC ACID, AQUEOUS SOLUTION with not more than 10 % chloric acid

UN 2626 — ADR 2025 Table A: class 5.1, classification code O1, packing group II, labels 5.1, special provisions 613, limited quantity 1 L, excepted quantity E0, packing instructions P504 IBC02, transport category 2, tunnel restriction code (E), hazard identification number 50.

UNECE ADR 2025, ECE/TRANS/352 · checked 2026-10-28

Table A — ADR 2025 (ECE/TRANS/352), UN 2626
(1) UN No.2626
(2) Name and descriptionCHLORIC ACID, AQUEOUS SOLUTION with not more than 10 % chloric acid
(3a) Class5.1
(3b) Classification codeO1
(4) Packing groupII
(5) Labels5.1
(6) Special provisions613
(7a) Limited quantities1 L
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP504 IBC02
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructionsT4
(11) Portable tanks and bulk containers: special provisionsTP1
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisionsTU3
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (E)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV24
(19) Special provisions for carriage: operation—
(20) Hazard identification No.50

ADR 2027 (accepted) — no change for UN 2626

ADR 2027 was accepted: depositary notification C.N.395.2026 (9 October 2026) records no objection to the amendments proposed by C.N.252.2026. It applies from 1 January 2027, and ADR 2025 may still be applied until 30 June 2027 (1.6.1.1). (C.N.395.2026)

ADR 2027: no Table A change for this entry (checked against ECE/TRANS/WP.15/274, Add.1 and Corr.1). Other parts of ADR 2027 may still affect its carriage.

ADR 2025 remains the edition FreightUtils serves and the one that applies until ADR 2027 takes effect on 1 January 2027; after that, ADR 2025 may still be applied until 30 June 2027 (1.6.1.1).

All ADR 2027 Table A changes →Check a list of UN numbers →

In plain words

Tunnels
Tunnel code (E): in tanks, Prohibited in E; in other carriage, Prohibited in E. Every category except E. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 2: at most 333 per transport unit under 1.1.3.6, counted ×3 toward the 1,000-point limit (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 5.1 (Oxidizing substances) (ADR 5.2.2.2.2, label model No. 5.1; paraphrase, not yet reviewed)
Packing
Packing instruction P504: Combination packagings by inner material (glass 5 l/75 kg, plastics 30 l/75 kg, metal 40 l/125 or 225 kg), single drums 250 l, jerricans 60 l, composites. Packing instruction IBC02: Liquids under IBC02 may use metal (31A/31B/31N), rigid plastics (31H1/31H2) or composite 31HZ1 IBCs, with B and BB limits per UN number. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P504, 4.1.4.2, IBC02, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T4: Portable tank, Class 1 and 3–9: test 2.65 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.3. Portable tank provision TP1: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.2 (the 97-based formula). Tank code L4BN: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings B, valves/devices N. — L: tank for liquid-state substances (liquids, or solids handed over molten); 4: minimum calculation pressure of 4 bar (see 6.8.2.1.14); B: filling or discharge openings at the bottom, each with 3 closures; N: has no 6.8.2.2.6 breather device and is not hermetically closed Tank provision TU3: Shell interior and every part touching the substance kept clean; no lubricant that could react dangerously with it on pumps or valves. Vehicle for tank carriage: AT — Tank vehicle for dangerous goods that is not EX/III, FL or a MEMU: tanks over 1 m³ / 3 m³, or battery-vehicle over 1 m³. (ADR 4.2.5.2.6, portable tank instruction T4, 4.2.5.3, TP1, 4.3.4.1.1, tank code L4BN, 4.3.5, TU3, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Loading provision CV24: Clean the vehicle or container of combustible debris before loading; no readily flammable stowage material. (ADR 7.5.11, CV24; paraphrase, not yet reviewed)

Assembled from FreightUtils' meanings of the Table A codes, not the official text. A statement marked “not yet reviewed” has not yet been checked against ADR by a person.

Class 5.1 — Oxidising Substances & Organic PeroxidesPacking Group II
UN 2626Class 5.1 — Oxidising Substances & Organic PeroxidesPG II
Packing Group
II
Medium danger
Classification Code
O1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
50
Kemler code
Limited Quantity
1 L
Max per inner package for LQ relief
Excepted Quantity
E0
EQ code for excepted quantity relief
Thresholds — why, not just the verdict
Transport Category
Category 2
×3 points per kg/L — up to 333 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
333 kg/L
Per-substance maximum for 1.1.3.6 relief (1.1.3.6.3)
Limited Quantity
1 L
Max per inner packaging for LQ relief (Chapter 3.4)
Excepted Quantity
E0
No excepted-quantity relief for this entry (Chapter 3.5)
Tunnel Code
Governs which tunnel categories the load may pass
Special Provisions
SP 613
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 5.1

These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.

Special Provisions
SP 613

Refer to ADR 2025 Chapter 3.3 for full text of each provision.

Check if UN 2626 qualifies for 1.1.3.6 exemption
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Other Oxidising Substances & Organic Peroxides near UN 2626 (Class 5.1)

UN 2547
SODIUM SUPEROXIDE
UN 2573
THALLIUM CHLORATE
UN 2627
NITRITES, INORGANIC, N.O.S.
UN 2719
BARIUM BROMATE
UN 2720
CHROMIUM NITRATE
All Class 5.1 UN numbers →
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📅Data: UNECE ADR 2025 (ECE/TRANS/352), via EU Directive 2008/68/EC. Last verified October 2026

ADR reference data only. Classification is the consignor's legal responsibility. Consult a DGSA for compliance decisions.

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