UN 3251 — ADR 2025 Table A: class 4.1, classification code SR1, packing group III, labels 4.1, special provisions 226 638, limited quantity 5 kg, excepted quantity E0, packing instructions P409, transport category 3, 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 3251
(1) UN No.	3251
(2) Name and description	ISOSORBIDE-5-MONONITRATE
(3a) Class	4.1
(3b) Classification code	SR1
(4) Packing group	III
(5) Labels	4.1
(6) Special provisions	226 638
(7a) Limited quantities	5 kg
(7b) Excepted quantities	E0
(8) Packaging: packing instructions	P409
(9a) Packaging: special packing provisions	—
(9b) Packaging: mixed packing provisions	MP2
(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)	3 (D)
(16) Special provisions for carriage: packages	—
(17) Special provisions for carriage: bulk	—
(18) Special provisions for carriage: loading, unloading and handling	CV14
(19) Special provisions for carriage: operation	S24
(20) Hazard identification No.	—

ADR 2027 (accepted) — no change for UN 3251

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 3: at most 1000 per transport unit under 1.1.3.6, counted ×1 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 P409: UN 2956, 3242, 3251: fibre drum (50 kg), fibreboard box with one plastics bag (50 kg), or 4G/1G with plastics inners of 5 kg (25 kg). Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P409, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Carriage: Loading provision CV14: Shield goods from direct sun and heat in transit; store packages only in cool, well-ventilated places away from heat. Operation provision S24: Chapter 8.4 vehicle supervision applies when the total mass in the vehicle exceeds 100 kg. (ADR 7.5.11, CV14, 8.5, S24; 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 3251Class 4.1 — Flammable SolidsPG III