UN 3501

CHEMICAL UNDER PRESSURE, FLAMMABLE, N.O.S.

UN 3501 — ADR 2025 Table A: class 2, classification code 8F, packing group —, labels 2.1, special provisions 274 659, limited quantity 0, excepted quantity E0, packing instructions P206, transport category 2, tunnel restriction code (B/D), hazard identification number 23.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3501
(1) UN No.3501
(2) Name and descriptionCHEMICAL UNDER PRESSURE, FLAMMABLE, N.O.S.
(3a) Class2
(3b) Classification code8F
(4) Packing group—
(5) Labels2.1
(6) Special provisions274 659
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP206
(9a) Packaging: special packing provisionsPP89
(9b) Packaging: mixed packing provisionsMP9
(10) Portable tanks and bulk containers: instructionsT50
(11) Portable tanks and bulk containers: special provisionsTP4 TP40
(12) ADR tank: tank code—
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageFL
(15) Transport category (Tunnel restriction code)2 (B/D)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV9 CV10 CV12 CV36
(19) Special provisions for carriage: operationS2
(20) Hazard identification No.23

ADR 2027 (accepted) — no change for UN 3501

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 (B/D): in tanks, Prohibited in B, C, D, E; in other carriage, Prohibited in D, E. Tanks: A only. Packages: 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 2.1 (Gases: flammable gases) (ADR 5.2.2.2.2, label model No. 2.1; paraphrase, not yet reviewed)
Packing
Packing instruction P206: Chemicals under pressure (UN 3500-3505) in Chapter 6.2 cylinders or pressure drums: 5-year test period, 95 % fill at 50 °C, min 20 bar test. Special packing provision PP89: UN 3501–3505: non-refillable cylinders may exceed 4.1.6.9 (b) up to 1 000 L divided by test pressure in bar, max 50 L per ISO 11118. Mixed packing provision MP9: May share a combination outer packaging with other Class 2 goods, with other classes that permit it, or with non-ADR goods. (ADR 4.1.4.1, P206, 4.1.4.1, P206, PP89, 4.1.10.4, MP9; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T50: Per-gas portable tank table for non-refrigerated liquefied gases and chemicals under pressure (UN 3500–3505): MAWP, openings, relief, filling. Portable tank provision TP4: Degree of filling capped at 90 %, or another figure the competent authority approves. Portable tank provision TP40: Portable tank must not be carried while connected to spray application equipment. Vehicle for tank carriage: FL — Vehicle for flammable liquids (flash point ≤ 60 °C), flammable gases or UN 2015 > 60 % in tanks above set sizes. (ADR 4.2.5.2.6, portable tank instruction T50, 4.2.5.3, TP4, 4.2.5.3, TP40, 9.1.1.2, FL vehicle; paraphrase, not yet reviewed)
Carriage
Loading provision CV9: Do not throw packages or subject them to impact; stow receptacles so they cannot tip over or fall. Loading provision CV10: Cylinders lie along or across the vehicle axis (across at the front wall); stable or secured ones may stand; flat ones must be wedged. Loading provision CV12: When stacking loaded pallets, spread each tier evenly over the one below, using strong interlayer material if needed. Loading provision CV36: Prefer open or ventilated units; if closed, isolate the cab from the load and mark doors "WARNING NO VENTILATION OPEN WITH CAUTION" (≥ 25 mm). Operation provision S2: Flammable liquids/gases: no ordinary portable lights in closed load compartments; FL heaters off during loading; earth FL vehicles before filling. (ADR 7.5.11, CV9, 7.5.11, CV10, 7.5.11, CV12, 7.5.11, CV36, 8.5, S2; 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 2 — Gases
UN 3501Class 2 — Gases
Packing Group
N/A
Not applicable
Classification Code
8F
Tunnel Code
(B/D) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
23
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 659
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 2.1

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

Special Provisions
SP 274SP 659

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

Check if UN 3501 qualifies for 1.1.3.6 exemption
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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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