UN 3237

SELF-REACTIVE LIQUID TYPE E, TEMPERATURE CONTROLLED

UN 3237 — ADR 2025 Table A: class 4.1, classification code SR2, packing group —, labels 4.1, special provisions 194 274, limited quantity 0, excepted quantity E0, packing instructions P520, transport category 1, tunnel restriction code (D), hazard identification number —.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3237
(1) UN No.3237
(2) Name and descriptionSELF-REACTIVE LIQUID TYPE E, TEMPERATURE CONTROLLED
(3a) Class4.1
(3b) Classification codeSR2
(4) Packing group—
(5) Labels4.1
(6) Special provisions194 274
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP520
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructions—
(11) Portable tanks and bulk containers: special provisions—
(12) ADR tank: tank code—
(13) ADR tank: special provisions—
(14) Vehicle for tank carriage—
(15) Transport category (Tunnel restriction code)1 (D)
(16) Special provisions for carriage: packagesV8
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV15 CV21 CV22
(19) Special provisions for carriage: operationS4 S19
(20) Hazard identification No.—

ADR 2027 (accepted) — no change for UN 3237

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=3237&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 (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 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 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 P520: Organic peroxides (5.2) and self-reactive substances (4.1): packing methods OP1-OP8 set per-package quantity limits; metal only for OP7/OP8. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P520, 4.1.10.4, MP2; 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. Loading provision CV15: Pointer: the mixed-loading limits in 7.5.5.3 apply. Loading provision CV21: Temperature-controlled carriage: inspect unit, brief the carrier, carry enough refrigerant, keep packages accessible, hold control temperature throughout. 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. Operation provision S4: Temperature control: see 7.1.7; not applicable to inhibitor-stabilized 3.1.2.6 substances with SADT above 50 °C. Operation provision S19: Chapter 8.4 vehicle supervision applies when the total mass in the vehicle exceeds 5 000 kg. (ADR 7.2.4, V8, 7.5.11, CV15, 7.5.11, CV21, 7.5.11, CV22, 8.5, S4, 8.5, S19; 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 Solids
UN 3237Class 4.1 — Flammable Solids
Packing Group
N/A
Not applicable
Classification Code
SR2
Tunnel Code
(D) meaning →
Code governing tunnel passage
Transport Category
1
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
—
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 194, SP 274
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 194SP 274

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

Check if UN 3237 qualifies for 1.1.3.6 exemption
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Other Flammable Solids near UN 3237 (Class 4.1)

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SELF-REACTIVE SOLID TYPE C, TEMP…
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UN 3236
SELF-REACTIVE SOLID TYPE D, TEMP…
UN 3238
SELF-REACTIVE SOLID TYPE E, TEMP…
UN 3239
SELF-REACTIVE LIQUID TYPE F, TEM…
All Class 4.1 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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