UN 3531

POLYMERIZING SUBSTANCE, SOLID, STABILIZED, N.O.S.

UN 3531 — ADR 2025 Table A: class 4.1, classification code PM1, packing group III, labels 4.1, special provisions 274 386 676, limited quantity 0, excepted quantity E0, packing instructions P002 IBC07, transport category 2, tunnel restriction code (D), hazard identification number 40.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3531
(1) UN No.3531
(2) Name and descriptionPOLYMERIZING SUBSTANCE, SOLID, STABILIZED, N.O.S.
(3a) Class4.1
(3b) Classification codePM1
(4) Packing groupIII
(5) Labels4.1
(6) Special provisions274 386 676
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP002 IBC07
(9a) Packaging: special packing provisionsPP92 B18
(9b) Packaging: mixed packing provisions—
(10) Portable tanks and bulk containers: instructionsT7
(11) Portable tanks and bulk containers: special provisionsTP4 TP6 TP33
(12) ADR tank: tank codeSGAN(+)
(13) ADR tank: special provisionsTU30 TE11
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (D)
(16) Special provisions for carriage: packagesV1
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV15 CV22
(19) Special provisions for carriage: operation—
(20) Hazard identification No.40

ADR 2027 (accepted) — no change for UN 3531

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 (D): in tanks, Prohibited in D, E; in other carriage, Prohibited in D, E. Categories A, B, C. (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 4.1 (Flammable solids, self-reactive and polymerizing substances, and solid desensitized explosives) (ADR 5.2.2.2.2, label model No. 4.1; paraphrase, not yet reviewed)
Packing
Packing instruction P002: General packing instruction for solids: combination, single, composite packagings and pressure receptacles, with net mass limits by packing group. Packing instruction IBC07: IBC07 adds wooden IBCs (11C, 11D, 11F) with siftproof liners to the metal, rigid plastics and composite types of IBC06. Special packing provision PP92: UN 3531 and 3533 packagings must be built to vent gas or vapour so pressure cannot burst them if stabilization fails. Special packing provision B18: UN 3531 and 3533 IBCs must be built to vent gas or vapour so pressure cannot burst them if stabilization fails. (ADR 4.1.4.1, P002, 4.1.4.2, IBC07, 4.1.4.1, P002, PP92, 4.1.4.2, IBC07, B18; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T7: Portable tank, Class 1 and 3–9: test 4 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.3. Portable tank provision TP4: Degree of filling capped at 90 %, or another figure the competent authority approves. Portable tank provision TP6: Tank needs pressure-relief devices sized to its capacity and the substance so it cannot burst, even in a fire. Portable tank provision TP33: The assigned tank instruction covers granular/powdered solids and solids loaded hot but carried as a solid mass. Tank code SGAN(+): ADR tank code for Classes 1 and 3–9: solid tank, G (general minimum), openings A, valves/devices N, suffix (+). — S: tank for solid-state substances (powdery or granular); G: minimum calculation pressure under the general requirements of 6.8.2.1.14; A: filling or discharge openings at the bottom, each with 2 closures; 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 TU30: Fill as set in the tank type-approval test report, and never above 90 % of capacity. Tank provision TE11: Shell and service equipment must keep out foreign matter, prevent leakage and stop dangerous decomposition pressure; a suitable safety valve suffices. 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 T7, 4.2.5.3, TP4, 4.2.5.3, TP6, 4.2.5.3, TP33, 4.3.4.1.1, tank code SGAN(+), 4.3.5, TU30, 6.8.4 (b), TE11, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Carriage provision V1: Packages must go on a closed or sheeted vehicle or in a closed or sheeted container; open vehicles and containers are not allowed. Loading provision CV15: Pointer: the mixed-loading limits in 7.5.5.3 apply. Loading provision CV22: Load for free air circulation; above 5 000 kg per vehicle or large container, split into stacks ≤ 5 000 kg with ≥ 0.05 m gaps. (ADR 7.2.4, V1, 7.5.11, CV15, 7.5.11, CV22; 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 4.1 — Flammable SolidsPacking Group III
UN 3531Class 4.1 — Flammable SolidsPG III
Packing Group
III
Low danger
Classification Code
PM1
Tunnel Code
(D) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
40
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 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
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 274, SP 386, SP 676
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 4.1

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

Special Provisions
SP 274SP 386SP 676

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

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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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