UN 1873

PERCHLORIC ACID with more than 50 % but not more than 72 % acid, by mass

UN 1873 — ADR 2025 Table A: class 5.1, classification code OC1, packing group I, labels 5.1 +8, special provisions 60, limited quantity 0, excepted quantity E0, packing instructions P502, transport category 1, tunnel restriction code (B/E), hazard identification number 558.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 1873
(1) UN No.1873
(2) Name and descriptionPERCHLORIC ACID with more than 50 % but not more than 72 % acid, by mass
(3a) Class5.1
(3b) Classification codeOC1
(4) Packing groupI
(5) Labels5.1 +8
(6) Special provisions60
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP502
(9a) Packaging: special packing provisionsPP28
(9b) Packaging: mixed packing provisionsMP3
(10) Portable tanks and bulk containers: instructionsT10
(11) Portable tanks and bulk containers: special provisionsTP1
(12) ADR tank: tank codeL4DN(+)
(13) ADR tank: special provisionsTU3 TU28
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)1 (B/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: operationS20
(20) Hazard identification No.558

ADR 2027 (accepted) — no change for UN 1873

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.

This entry under ADR 2027 on the API: /api/adr?un=1873&edition=2027 (editions and as_of).

ADR 2025 is the edition that applies until ADR 2027 takes effect on 1 January 2027, and FreightUtils answers on it by default until then; the API answers on ADR 2027 now with edition=2027. After that date, 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 (B/E): in tanks, Prohibited in B, C, D, E; in other carriage, Prohibited in E. Tanks: A only. Packages: A, B, C, D. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 1: at most 20 per transport unit under 1.1.3.6, counted ×50 toward the 1,000-point limit (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 5.1 (Oxidizing substances), model 8 (Corrosive substances) (ADR 5.2.2.2.2, label model No. 5.1, 5.2.2.2.2, label model No. 8; paraphrase, not yet reviewed)
Packing
Packing instruction P502: Oxidizing liquids: inners of 5 l in drums or boxes up to 125 kg (4H1 60 kg), single drums 250 l, jerricans 60 l, composite packagings. Special packing provision PP28: UN 1873: packaging parts in direct contact with perchloric acid must be glass or plastics. Mixed packing provision MP3: UN 1873 may be packed together with UN 1802. (ADR 4.1.4.1, P502, 4.1.4.1, P502, PP28, 4.1.10.4, MP3; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T10: Portable tank, Class 1 and 3–9: test 4 bar; shell 6 mm; relief See 6.7.2.8.3; bottom openings Not allowed. 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 L4DN(+): ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings D, valves/devices N, suffix (+). — 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); D: filled and discharged from the top; nothing opens below the liquid surface; N: has no 6.8.2.2.6 breather device and is not hermetically closed; (+): alternative use of the tank for other substances is allowed only where the certificate of type approval says so (3.2.1 column (12); 4.3.4.1.3) 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. Tank provision TU28: Tanks may be filled to no more than 95 % of capacity at a reference temperature of 15 °C. 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 T10, 4.2.5.3, TP1, 4.3.4.1.1, tank code L4DN(+), 4.3.5, TU3, 4.3.5, TU28, 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. Operation provision S20: Chapter 8.4 supervision applies above 10 000 kg in packages, or above 3 000 litres in tanks. (ADR 7.5.11, CV24, 8.5, S20; 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 I
UN 1873Class 5.1 — Oxidising Substances & Organic PeroxidesPG I
Packing Group
I
High danger
Classification Code
OC1
Tunnel Code
(B/E) meaning →
Code governing tunnel passage
Transport Category
1
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
558
Kemler code
Limited Quantity
0
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 1
×50 points per kg/L — up to 20 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
20 kg/L
Per-substance maximum for 1.1.3.6 relief (1.1.3.6.3)
Limited Quantity
Not permitted
No limited-quantity relief for this entry (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 60
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 5.1Label 8

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

Special Provisions
SP 60

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

Check if UN 1873 qualifies for 1.1.3.6 exemption
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Other Oxidising Substances & Organic Peroxides near UN 1873 (Class 5.1)

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AMMONIUM NITRATE with not more t…
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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