UN 1409

METAL HYDRIDES, WATER-REACTIVE, N.O.S.

UN 1409 (variant 1 of 2, packing group I) — ADR 2025 Table A: class 4.3, classification code W2, packing group I, labels 4.3, special provisions 274 508, limited quantity 0, excepted quantity E0, packing instructions P403, transport category 1, tunnel restriction code (E), hazard identification number —.

UN 1409 (variant 2 of 2, packing group II) — ADR 2025 Table A: class 4.3, classification code W2, packing group II, labels 4.3, special provisions 274 508, limited quantity 500 g, excepted quantity E2, packing instructions P410 IBC04, transport category 2, tunnel restriction code (D/E), hazard identification number 423.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 1409 — variant 1 of 2, packing group I
(1) UN No.1409
(2) Name and descriptionMETAL HYDRIDES, WATER-REACTIVE, N.O.S.
(3a) Class4.3
(3b) Classification codeW2
(4) Packing groupI
(5) Labels4.3
(6) Special provisions274 508
(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: 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 (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.—
Table A — ADR 2025 (ECE/TRANS/352), UN 1409 — variant 2 of 2, packing group II
(1) UN No.1409
(2) Name and descriptionMETAL HYDRIDES, WATER-REACTIVE, N.O.S.
(3a) Class4.3
(3b) Classification codeW2
(4) Packing groupII
(5) Labels4.3
(6) Special provisions274 508
(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
(12) ADR tank: tank codeSGAN
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (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

ADR 2027 (accepted) — no change for UN 1409

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=1409&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 — variant 1 of 2, packing group I

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 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 4.3 (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 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)
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 2, 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 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 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 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. 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 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, 4.3.4.1.1, tank code SGAN, 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 I2 variants
UN 1409 has 2 classification variants in ADR 2025 — different hazard divisions or descriptions for the same UN number. Each variant may have different transport requirements.
UN 1409Class 4.3 — Flammable SolidsPG IVariant 1 of 2
METAL HYDRIDES, WATER-REACTIVE, N.O.S.
Packing Group
I
High danger
Classification Code
W2
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
1
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
—
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 1
×50 points per kg/L — up to 20 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
20 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 508
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 274SP 508

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

UN 1409Class 4.3 — Flammable SolidsPG IIVariant 2 of 2
METAL HYDRIDES, WATER-REACTIVE, N.O.S.
Packing Group
II
Medium danger
Classification Code
W2
Tunnel Code
(D/E) meaning →
Code governing tunnel passage
Transport Category
2
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 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
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, SP 508
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 274SP 508

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

Check if UN 1409 qualifies for 1.1.3.6 exemption
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Other Flammable Solids near UN 1409 (Class 4.3)

UN 1405
CALCIUM SILICIDE
UN 1407
CAESIUM
UN 1408
FERROSILICON with 30 % or more b…
UN 1410
LITHIUM ALUMINIUM HYDRIDE
UN 1411
LITHIUM ALUMINIUM HYDRIDE, ETHEREAL
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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