UN 3398

ORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE

UN 3398 (variant 1 of 3, packing group I) — ADR 2025 Table A: class 4.3, classification code W1, packing group I, labels 4.3, special provisions 274, limited quantity 0, excepted quantity E0, packing instructions P402, transport category 0, tunnel restriction code (B/E), hazard identification number X323.

UN 3398 (variant 2 of 3, packing group II) — ADR 2025 Table A: class 4.3, classification code W1, packing group II, labels 4.3, special provisions 274, limited quantity 500 ml, excepted quantity E2, packing instructions P001 IBC01, transport category 0, tunnel restriction code (D/E), hazard identification number 323.

UN 3398 (variant 3 of 3, packing group III) — ADR 2025 Table A: class 4.3, classification code W1, packing group III, labels 4.3, special provisions 274, limited quantity 1 L, excepted quantity E1, packing instructions P001 IBC02, transport category 0, tunnel restriction code (E), hazard identification number 323.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3398 — variant 1 of 3, packing group I
(1) UN No.3398
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
(3a) Class4.3
(3b) Classification codeW1
(4) Packing groupI
(5) Labels4.3
(6) Special provisions274
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP402
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructionsT13
(11) Portable tanks and bulk containers: special provisionsTP2 TP7 TP36 TP41
(12) ADR tank: tank codeL10DH
(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.X323
Table A — ADR 2025 (ECE/TRANS/352), UN 3398 — variant 2 of 3, packing group II
(1) UN No.3398
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
(3a) Class4.3
(3b) Classification codeW1
(4) Packing groupII
(5) Labels4.3
(6) Special provisions274
(7a) Limited quantities500 ml
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP001 IBC01
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT7
(11) Portable tanks and bulk containers: special provisionsTP2 TP7 TP36 TP41
(12) ADR tank: tank codeL4DH
(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.323
Table A — ADR 2025 (ECE/TRANS/352), UN 3398 — variant 3 of 3, packing group III
(1) UN No.3398
(2) Name and descriptionORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
(3a) Class4.3
(3b) Classification codeW1
(4) Packing groupIII
(5) Labels4.3
(6) Special provisions274
(7a) Limited quantities1 L
(7b) Excepted quantitiesE1
(8) Packaging: packing instructionsP001 IBC02
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT7
(11) Portable tanks and bulk containers: special provisionsTP2 TP7 TP36 TP41
(12) ADR tank: tank codeL4DH
(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.323

ADR 2027 (accepted) — no change for UN 3398

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) (ADR 5.2.2.2.2, label model No. 4.3; paraphrase, not yet reviewed)
Packing
Packing instruction P402: Steel pressure receptacles at 6 bar, combination packagings (glass 10 kg / metal or plastics 15 kg inners, 125 kg outer), 1A1 drums or 6HA1/6HB1 up to 250 l. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P402, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T13: Portable tank, Class 1 and 3–9: test 6 bar; shell 6 mm; relief Normal; bottom openings Not allowed. Portable tank provision TP2: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.3 (the 95-based formula). Portable tank provision TP7: Air must be removed from the vapour space, by nitrogen or another method. 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 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 T13, 4.2.5.3, TP2, 4.2.5.3, TP7, 4.2.5.3, TP36, 4.2.5.3, TP41, 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) (ADR 5.2.2.2.2, label model No. 4.3; paraphrase, not yet reviewed)
Packing
Packing instruction P001: General packing instruction for liquids: combination, single, composite packagings and pressure receptacles, with capacity/mass limits by packing group. Packing instruction IBC01: Liquids under IBC01 may go only in metal IBCs of types 31A, 31B or 31N, subject to the general packing rules. Mixed packing provision MP15: Up to 3 litres 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, P001, 4.1.4.2, IBC01, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T7: Portable tank, Class 1 and 3–9: test 4 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.3. Portable tank provision TP2: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.3 (the 95-based formula). Portable tank provision TP7: Air must be removed from the vapour space, by nitrogen or another method. 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 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 T7, 4.2.5.3, TP2, 4.2.5.3, TP7, 4.2.5.3, TP36, 4.2.5.3, TP41, 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) (ADR 5.2.2.2.2, label model No. 4.3; paraphrase, not yet reviewed)
Packing
Packing instruction P001: General packing instruction for liquids: combination, single, composite packagings and pressure receptacles, with capacity/mass limits by packing group. Packing instruction IBC02: Liquids under IBC02 may use metal (31A/31B/31N), rigid plastics (31H1/31H2) or composite 31HZ1 IBCs, with B and BB limits per UN number. Mixed packing provision MP15: Up to 3 litres 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, P001, 4.1.4.2, IBC02, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T7: Portable tank, Class 1 and 3–9: test 4 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.3. Portable tank provision TP2: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.3 (the 95-based formula). Portable tank provision TP7: Air must be removed from the vapour space, by nitrogen or another method. 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 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 T7, 4.2.5.3, TP2, 4.2.5.3, TP7, 4.2.5.3, TP36, 4.2.5.3, TP41, 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 3398 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 3398Class 4.3 — Flammable SolidsPG IVariant 1 of 3
ORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
Packing Group
I
High danger
Classification Code
W1
Tunnel Code
(B/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
X323
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 4.3

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.

UN 3398Class 4.3 — Flammable SolidsPG IIVariant 2 of 3
ORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
Packing Group
II
Medium danger
Classification Code
W1
Tunnel Code
(D/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
323
Kemler code
Limited Quantity
500 ml
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 ml
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 4.3

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.

UN 3398Class 4.3 — Flammable SolidsPG IIIVariant 3 of 3
ORGANOMETALLIC SUBSTANCE, LIQUID, WATER-REACTIVE
Packing Group
III
Low danger
Classification Code
W1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
323
Kemler code
Limited Quantity
1 L
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 L
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 4.3

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 3398 qualifies for 1.1.3.6 exemption
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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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