UN 2531

METHACRYLIC ACID, STABILIZED

UN 2531 — ADR 2025 Table A: class 8, classification code C3, packing group II, labels 8, special provisions 386 676, limited quantity 1 L, excepted quantity E2, packing instructions P001 IBC02 LP01, transport category 2, tunnel restriction code (E), hazard identification number 89.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 2531
(1) UN No.2531
(2) Name and descriptionMETHACRYLIC ACID, STABILIZED
(3a) Class8
(3b) Classification codeC3
(4) Packing groupII
(5) Labels8
(6) Special provisions386 676
(7a) Limited quantities1 L
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP001 IBC02 LP01
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT7
(11) Portable tanks and bulk containers: special provisionsTP2 TP18 TP30
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (E)
(16) Special provisions for carriage: packagesV8
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operationS4
(20) Hazard identification No.89

ADR 2027 (accepted) — no change for UN 2531

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 8 (Corrosive substances) (ADR 5.2.2.2.2, label model No. 8; paraphrase, not yet reviewed)
Packing
Packing instruction P001: General packing instruction for liquids: combination, single, composite packagings and pressure receptacles, with capacity/mass limits by packing group. 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. Packing instruction LP01: Liquids in large packagings: glass, plastics or metal inners in 50-series outers, packing group III only, up to 3 m3. Mixed packing provision MP15: Up to 3 litres per inner packaging may be mixed with goods of other codes or classes that permit it, or with non-ADR goods. (ADR 4.1.4.1, P001, 4.1.4.2, IBC02, 4.1.4.3, LP01, 4.1.10.4, MP15; 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 TP2: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.3 (the 95-based formula). Portable tank provision TP18: Keep between 18 °C and 40 °C; tanks with solidified methacrylic acid must not be reheated in transit. Portable tank provision TP30: Only in insulated tanks. 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 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, TP2, 4.2.5.3, TP18, 4.2.5.3, TP30, 4.3.4.1.1, tank code L4BN, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Carriage provision V8: Temperature control applies: follow 7.1.7; not applicable to inhibitor-stabilized 3.1.2.6 substances with SADT above 50 °C. Operation provision S4: Temperature control: see 7.1.7; not applicable to inhibitor-stabilized 3.1.2.6 substances with SADT above 50 °C. (ADR 7.2.4, V8, 8.5, S4; 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 8 — Corrosive SubstancesPacking Group II
UN 2531Class 8 — Corrosive SubstancesPG II
Packing Group
II
Medium danger
Classification Code
C3
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
89
Kemler code
Limited Quantity
1 L
Max per inner package for LQ relief
Excepted Quantity
E2
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
E2
Max 30 ml/g per inner, 500 ml/g per outer package (Chapter 3.5)
Tunnel Code
Governs which tunnel categories the load may pass
Special Provisions
SP 386, SP 676
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 8

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

Special Provisions
SP 386SP 676

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

Check if UN 2531 qualifies for 1.1.3.6 exemption
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Other Corrosive Substances near UN 2531 (Class 8)

UN 2507
CHLOROPLATINIC ACID, SOLID
UN 2508
MOLYBDENUM PENTACHLORIDE
UN 2509
POTASSIUM HYDROGEN SULPHATE
UN 2511
2-CHLOROPROPIONIC ACID
UN 2513
BROMOACETYL BROMIDE
All Class 8 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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