UN 3396

ORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE

UN 3396 (variant 1 of 3, packing group I) — ADR 2025 Table A: class 4.3, classification code WF2, packing group I, labels 4.3 +4.1, special provisions 274, limited quantity 0, excepted quantity E0, packing instructions P403, transport category 0, tunnel restriction code (B/E), hazard identification number X423.

UN 3396 (variant 2 of 3, packing group II) — ADR 2025 Table A: class 4.3, classification code WF2, packing group II, labels 4.3 +4.1, special provisions 274, limited quantity 500 g, excepted quantity E2, packing instructions P410 IBC04, transport category 0, tunnel restriction code (D/E), hazard identification number 423.

UN 3396 (variant 3 of 3, packing group III) — ADR 2025 Table A: class 4.3, classification code WF2, packing group III, labels 4.3 +4.1, special provisions 274, limited quantity 1 kg, excepted quantity E1, packing instructions P410 IBC06, transport category 0, tunnel restriction code (E), hazard identification number 423.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3396 — variant 1 of 3, packing group I
(1) UN No.3396
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
(3a) Class4.3
(3b) Classification codeWF2
(4) Packing groupI
(5) Labels4.3 +4.1
(6) Special provisions274
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP403
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructionsT9
(11) Portable tanks and bulk containers: special provisionsTP7 TP33 TP36 TP41
(12) ADR tank: tank codeS10AN L10DH
(13) ADR tank: special provisionsTU4 TU14 TU22 TE21 TM2
(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 handlingCV23
(19) Special provisions for carriage: operationS20
(20) Hazard identification No.X423
Table A — ADR 2025 (ECE/TRANS/352), UN 3396 — variant 2 of 3, packing group II
(1) UN No.3396
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
(3a) Class4.3
(3b) Classification codeWF2
(4) Packing groupII
(5) Labels4.3 +4.1
(6) Special provisions274
(7a) Limited quantities500 g
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP410 IBC04
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP14
(10) Portable tanks and bulk containers: instructionsT3
(11) Portable tanks and bulk containers: special provisionsTP33 TP36 TP41
(12) ADR tank: tank codeSGAN L4DH
(13) ADR tank: special provisionsTU14 TE21 TM2
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)0 (D/E)
(16) Special provisions for carriage: packagesV1
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV23
(19) Special provisions for carriage: operation—
(20) Hazard identification No.423
Table A — ADR 2025 (ECE/TRANS/352), UN 3396 — variant 3 of 3, packing group III
(1) UN No.3396
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
(3a) Class4.3
(3b) Classification codeWF2
(4) Packing groupIII
(5) Labels4.3 +4.1
(6) Special provisions274
(7a) Limited quantities1 kg
(7b) Excepted quantitiesE1
(8) Packaging: packing instructionsP410 IBC06
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP14
(10) Portable tanks and bulk containers: instructionsT1
(11) Portable tanks and bulk containers: special provisionsTP33 TP36 TP41
(12) ADR tank: tank codeSGAN L4DH
(13) ADR tank: special provisionsTU14 TE21 TM2
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)0 (E)
(16) Special provisions for carriage: packagesV1
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV23
(19) Special provisions for carriage: operation—
(20) Hazard identification No.423

ADR 2027 (accepted) — no change for UN 3396

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 — variant 1 of 3, packing group I

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 4.3 (Substances which emit flammable gases in contact with water), model 4.1 (Flammable solids, self-reactive and polymerizing substances, and solid desensitized explosives) (ADR 5.2.2.2.2, label model No. 4.3, 5.2.2.2.2, label model No. 4.1; paraphrase, not yet reviewed)
Packing
Packing instruction P403: Hermetically sealed solids packagings: combination (inners glass 2 kg, plastics 15 kg, metal 20 kg), single drums/jerricans, composites, pressure receptacles. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P403, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T9: Portable tank, Class 1 and 3–9: test 4 bar; shell 6 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 S10AN: ADR tank code for Classes 1 and 3–9: solid tank, 10 bar, openings A, valves/devices N. — S: tank for solid-state substances (powdery or granular); 10: minimum calculation pressure of 10 bar (see 6.8.2.1.14); A: filling or discharge openings at the bottom, each with 2 closures; N: has no 6.8.2.2.6 breather device and is not hermetically closed Tank code L10DH: ADR tank code for Classes 1 and 3–9: liquid tank, 10 bar, openings D, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 10: minimum calculation pressure of 10 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 TE21: Closures must be protected by lockable caps. Tank provision TM2: Tanks must additionally be marked "Do not open during carriage" and "Gives off flammable gases on contact with water". 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 T9, 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 S10AN, 4.3.4.1.1, tank code L10DH, 4.3.5, TU4, 4.3.5, TU14, 4.3.5, TU22, 6.8.4 (b), TE21, 6.8.4 (e), TM2, 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. Loading provision CV23: Take special measures when handling packages so they never come into contact with water. 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, 7.5.11, CV23, 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.

In plain words — variant 2 of 3, packing group II

Tunnels
Tunnel code (D/E): in tanks, Prohibited in D, E (bulk or tanks); in other carriage, Prohibited in E. Bulk/tanks: A, B, C. 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 4.3 (Substances which emit flammable gases in contact with water), model 4.1 (Flammable solids, self-reactive and polymerizing substances, and solid desensitized explosives) (ADR 5.2.2.2.2, label model No. 4.3, 5.2.2.2.2, label model No. 4.1; paraphrase, not yet reviewed)
Packing
Packing instruction P410: Solids of PG II/III: combination, single drums, jerricans, boxes, bags, composites and pressure receptacles, with net mass limits. Packing instruction IBC04: Solids under IBC04 may go only in metal IBCs (11A, 11B, 11N, 21A, 21B, 21N, 31A, 31B, 31N). Mixed packing provision MP14: Up to 6 kg per inner packaging may be mixed with goods of other codes or classes that permit it, or with non-ADR goods. (ADR 4.1.4.1, P410, 4.1.4.2, IBC04, 4.1.10.4, MP14; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T3: Portable tank, Class 1 and 3–9: test 2.65 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.2. 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 SGAN: ADR tank code for Classes 1 and 3–9: solid tank, G (general minimum), openings A, valves/devices N. — S: tank for solid-state substances (powdery or granular); G: minimum calculation pressure under the general requirements of 6.8.2.1.14; A: filling or discharge openings at the bottom, each with 2 closures; N: has no 6.8.2.2.6 breather device and is not hermetically closed Tank code L4DH: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings D, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 4: minimum calculation pressure of 4 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 TU14: Protective caps on the closures must be locked during carriage. Tank provision TE21: Closures must be protected by lockable caps. Tank provision TM2: Tanks must additionally be marked "Do not open during carriage" and "Gives off flammable gases on contact with water". 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 T3, 4.2.5.3, TP33, 4.2.5.3, TP36, 4.2.5.3, TP41, 4.3.4.1.1, tank code SGAN, 4.3.4.1.1, tank code L4DH, 4.3.5, TU14, 6.8.4 (b), TE21, 6.8.4 (e), TM2, 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. Loading provision CV23: Take special measures when handling packages so they never come into contact with water. (ADR 7.2.4, V1, 7.5.11, CV23; 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.

In plain words — variant 3 of 3, packing group III

Tunnels
Tunnel code (E): in tanks, Prohibited in E; in other carriage, Prohibited in E. Every category except E. (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 4.3 (Substances which emit flammable gases in contact with water), model 4.1 (Flammable solids, self-reactive and polymerizing substances, and solid desensitized explosives) (ADR 5.2.2.2.2, label model No. 4.3, 5.2.2.2.2, label model No. 4.1; paraphrase, not yet reviewed)
Packing
Packing instruction P410: Solids of PG II/III: combination, single drums, jerricans, boxes, bags, composites and pressure receptacles, with net mass limits. Packing instruction IBC06: Solids under IBC06 may use metal, rigid plastics or composite (11HZ1/11HZ2/21HZ1/21HZ2/31HZ1) IBCs; see 4.1.3.4 if they may liquefy. Mixed packing provision MP14: Up to 6 kg per inner packaging may be mixed with goods of other codes or classes that permit it, or with non-ADR goods. (ADR 4.1.4.1, P410, 4.1.4.2, IBC06, 4.1.10.4, MP14; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T1: Portable tank, Class 1 and 3–9: test 1.5 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.2. 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 SGAN: ADR tank code for Classes 1 and 3–9: solid tank, G (general minimum), openings A, valves/devices N. — S: tank for solid-state substances (powdery or granular); G: minimum calculation pressure under the general requirements of 6.8.2.1.14; A: filling or discharge openings at the bottom, each with 2 closures; N: has no 6.8.2.2.6 breather device and is not hermetically closed Tank code L4DH: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings D, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 4: minimum calculation pressure of 4 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 TU14: Protective caps on the closures must be locked during carriage. Tank provision TE21: Closures must be protected by lockable caps. Tank provision TM2: Tanks must additionally be marked "Do not open during carriage" and "Gives off flammable gases on contact with water". 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 T1, 4.2.5.3, TP33, 4.2.5.3, TP36, 4.2.5.3, TP41, 4.3.4.1.1, tank code SGAN, 4.3.4.1.1, tank code L4DH, 4.3.5, TU14, 6.8.4 (b), TE21, 6.8.4 (e), TM2, 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. Loading provision CV23: Take special measures when handling packages so they never come into contact with water. (ADR 7.2.4, V1, 7.5.11, CV23; 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 4.3 — Flammable SolidsPacking Group I3 variants
UN 3396 has 3 classification variants in ADR 2025 — different hazard divisions or descriptions for the same UN number. Each variant may have different transport requirements.
UN 3396Class 4.3 — Flammable SolidsPG IVariant 1 of 3
ORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
Packing Group
I
High danger
Classification Code
WF2
Tunnel Code
(B/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
X423
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 4.3Label 4.1

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.

UN 3396Class 4.3 — Flammable SolidsPG IIVariant 2 of 3
ORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
Packing Group
II
Medium danger
Classification Code
WF2
Tunnel Code
(D/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
423
Kemler code
Limited Quantity
500 g
Max per inner package for LQ relief
Excepted Quantity
E2
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
500 g
Max per inner packaging for LQ relief (Chapter 3.4)
Excepted Quantity
E2
Max 30 ml/g per inner, 500 ml/g per outer package (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 4.3Label 4.1

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.

UN 3396Class 4.3 — Flammable SolidsPG IIIVariant 3 of 3
ORGANOMETALLIC SUBSTANCE, SOLID, WATER-REACTIVE, FLAMMABLE
Packing Group
III
Low danger
Classification Code
WF2
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
423
Kemler code
Limited Quantity
1 kg
Max per inner package for LQ relief
Excepted Quantity
E1
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
1 kg
Max per inner packaging for LQ relief (Chapter 3.4)
Excepted Quantity
E1
Max 30 ml/g per inner, 1,000 ml/g per outer package (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 4.3Label 4.1

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 3396 qualifies for 1.1.3.6 exemption
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Other Flammable Solids near UN 3396 (Class 4.3)

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ORGANOMETALLIC SUBSTANCE, SOLID,…
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UN 3401
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All Class 4.3 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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