UN 3393

ORGANOMETALLIC SUBSTANCE, SOLID, PYROPHORIC, WATER-REACTIVE

UN 3393 — ADR 2025 Table A: class 4.2, classification code SW1, packing group I, labels 4.2 +4.3, special provisions 274, limited quantity 0, excepted quantity E0, packing instructions P404, transport category 0, tunnel restriction code (B/E), hazard identification number X432.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3393
(1) UN No.3393
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, SOLID, PYROPHORIC, WATER-REACTIVE
(3a) Class4.2
(3b) Classification codeSW1
(4) Packing groupI
(5) Labels4.2 +4.3
(6) Special provisions274
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP404
(9a) Packaging: special packing provisionsPP86
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructionsT21
(11) Portable tanks and bulk containers: special provisionsTP7 TP33 TP36 TP41
(12) ADR tank: tank codeL21DH
(13) ADR tank: special provisionsTU4 TU14 TU22 TC1 TE21 TM1
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)0 (B/E)
(16) Special provisions for carriage: packagesV1
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operationS20
(20) Hazard identification No.X432

ADR 2027 (accepted) — no change for UN 3393

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/E): in tanks, Prohibited in B, C, D, E; in other carriage, Prohibited in E. Tanks: A only. Packages: A, B, C, D. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 0: no 1.1.3.6 exemption applies (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 4.2 (Substances liable to spontaneous combustion), model 4.3 (Substances which emit flammable gases in contact with water) (ADR 5.2.2.2.2, label model No. 4.2, 5.2.2.2.2, label model No. 4.3; paraphrase, not yet reviewed)
Packing
Packing instruction P404: Pyrophoric solids: sealed metal (15 kg) or canned glass (1 kg) inners in 125 kg outers, metal or composite packagings to 150 kg gross, or pressure receptacles. Special packing provision PP86: Air must be removed from the vapour space with nitrogen or other means (UN 3392, 3394 in P400; UN 3391, 3393 in P404). Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P404, 4.1.4.1, P400, PP86, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T21: Portable tank, Class 1 and 3–9: test 10 bar; shell 10 mm; relief Normal; bottom openings Not allowed. Portable tank provision TP7: Air must be removed from the vapour space, by nitrogen or another method. Portable tank provision TP33: The assigned tank instruction covers granular/powdered solids and solids loaded hot but carried as a solid mass. Portable tank provision TP36: Fusible elements may be fitted in the vapour space of the portable tank. Portable tank provision TP41: With competent authority agreement, the 2.5-year internal examination may be waived for tanks dedicated to these organometallics. Tank code L21DH: ADR tank code for Classes 1 and 3–9: liquid tank, 21 bar, openings D, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 21: minimum calculation pressure of 21 bar (see 6.8.2.1.14); D: filled and discharged from the top; nothing opens below the liquid surface; H: hermetically closed (see 1.2.1) Tank provision TU4: Cargo kept under an inert gas blanket of 50 kPa (0.5 bar) gauge or more; uncleaned empty tanks likewise charged with inert gas. Tank provision TU14: Protective caps on the closures must be locked during carriage. Tank provision TU22: Fill to no more than 90 % of capacity; for liquids leave 5 % empty at an average liquid temperature of 50 °C. Tank provision TC1: The materials and construction requirements of 6.8.5 apply to these shells. Tank provision TE21: Closures must be protected by lockable caps. Tank provision TM1: Tanks must additionally be marked "Do not open during carriage. Liable to spontaneous combustion". 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 T21, 4.2.5.3, TP7, 4.2.5.3, TP33, 4.2.5.3, TP36, 4.2.5.3, TP41, 4.3.4.1.1, tank code L21DH, 4.3.5, TU4, 4.3.5, TU14, 4.3.5, TU22, 6.8.4 (a), TC1, 6.8.4 (b), TE21, 6.8.4 (e), TM1, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Carriage provision V1: Packages must go on a closed or sheeted vehicle or in a closed or sheeted container; open vehicles and containers are not allowed. Operation provision S20: Chapter 8.4 supervision applies above 10 000 kg in packages, or above 3 000 litres in tanks. (ADR 7.2.4, V1, 8.5, S20; 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 4.2 — Flammable SolidsPacking Group I
UN 3393Class 4.2 — Flammable SolidsPG I
Packing Group
I
High danger
Classification Code
SW1
Tunnel Code
(B/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
X432
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 0
Never exempt — any quantity requires full ADR compliance
Per-substance max
0 kg/L
Per-substance maximum (1.1.3.6.3) — Category 0 is never exempt
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
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 4.2Label 4.3

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

Special Provisions
SP 274

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

Check if UN 3393 qualifies for 1.1.3.6 exemption
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All Class 4.2 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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