UN 3474 — ADR 2025 Table A: class 4.1, classification code D, packing group I, labels 4.1, special provisions —, limited quantity 0, excepted quantity E0, packing instructions P406, transport category 1, tunnel restriction code (B), hazard identification number —.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3474
(1) UN No.	3474
(2) Name and description	1‑HYDROXYBENZOTRIAZOLE MONOHYDRATE
(3a) Class	4.1
(3b) Classification code	D
(4) Packing group	I
(5) Labels	4.1
(6) Special provisions	—
(7a) Limited quantities	0
(7b) Excepted quantities	E0
(8) Packaging: packing instructions	P406
(9a) Packaging: special packing provisions	PP48
(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)	1 (B)
(16) Special provisions for carriage: packages	—
(17) Special provisions for carriage: bulk	—
(18) Special provisions for carriage: loading, unloading and handling	—
(19) Special provisions for carriage: operation	S17
(20) Hazard identification No.	—

ADR 2027 (accepted) — no change for UN 3474

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=3474&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): in tanks, Prohibited in B, C, D, E; in other carriage, Prohibited in B, C, D, E. Category A tunnels only. (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 P406: Desensitized substances: water-resistant combination, lined single or plastics/metal packagings that keep the wetting agent in and cap pressure at 300 kPa. Special packing provision PP48: No metal packagings for the listed substance; small metal fittings such as closures do not make a packaging metal. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P406, 4.1.4.1, P112(c), PP48, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Carriage: Operation provision S17: Chapter 8.4 vehicle supervision applies when the total mass in the vehicle exceeds 1 000 kg. (ADR 8.5, S17; 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 I

UN 3474Class 4.1 — Flammable SolidsPG I