UN 3257

ELEVATED TEMPERATURE LIQUID, N.O.S., at or above 100 °C and below its flash-point (including molten metals, molten salts, etc.), filled at a temperature higher than 190 °C

UN 3257 (variant 1 of 2, packing group III) — ADR 2025 Table A: class 9, classification code M9, packing group III, labels 9, special provisions 274 643 668, limited quantity 0, excepted quantity E0, packing instructions P099 IBC99, transport category 3, tunnel restriction code (D), hazard identification number 99.

UN 3257 (variant 2 of 2, packing group III) — ADR 2025 Table A: class 9, classification code M9, packing group III, labels 9, special provisions 274 643 668, limited quantity 0, excepted quantity E0, packing instructions P099 IBC99, transport category 3, tunnel restriction code (D), hazard identification number 99.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3257 — variant 1 of 2, packing group III
(1) UN No.3257
(2) Name and descriptionELEVATED TEMPERATURE LIQUID, N.O.S., at or above 100 °C and below its flash-point (including molten metals, molten salts, etc.), filled at a temperature higher than 190 °C
(3a) Class9
(3b) Classification codeM9
(4) Packing groupIII
(5) Labels9
(6) Special provisions274 643 668
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP099 IBC99
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisions—
(10) Portable tanks and bulk containers: instructionsT3
(11) Portable tanks and bulk containers: special provisionsTP3 TP29
(12) ADR tank: tank codeLGAV
(13) ADR tank: special provisionsTU35 TC7 TE6 TE14 TE18 TE24
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)3 (D)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulkVC3 AP11
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operation—
(20) Hazard identification No.99
Table A — ADR 2025 (ECE/TRANS/352), UN 3257 — variant 2 of 2, packing group III
(1) UN No.3257
(2) Name and descriptionELEVATED TEMPERATURE LIQUID, N.O.S., at or above 100 °C and below its flash-point (including molten metals, molten salts, etc.), filled at or below 190 °C
(3a) Class9
(3b) Classification codeM9
(4) Packing groupIII
(5) Labels9
(6) Special provisions274 643 668
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP099 IBC99
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisions—
(10) Portable tanks and bulk containers: instructionsT3
(11) Portable tanks and bulk containers: special provisionsTP3 TP29
(12) ADR tank: tank codeLGAV
(13) ADR tank: special provisionsTU35 TC7 TE6 TE14 TE24
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)3 (D)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulkVC3
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operation—
(20) Hazard identification No.99

ADR 2027 (accepted) — no change for UN 3257

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=3257&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 III

Tunnels
Tunnel code (D): in tanks, Prohibited in D, E; in other carriage, Prohibited in D, E. Categories A, B, C. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 3: at most 1000 per transport unit under 1.1.3.6, counted ×1 toward the 1,000-point limit (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 9 (Miscellaneous dangerous substances and articles) (ADR 5.2.2.2.2, label model No. 9; paraphrase, not yet reviewed)
Packing
Packing instruction P099: Only packagings approved for the goods by the competent authority; approval copy or a transport-document statement must accompany the load. Packing instruction IBC99: IBC99: only IBCs the competent authority has approved for the goods may be used, with proof of approval travelling with each consignment. (ADR 4.1.4.1, P099, 4.1.4.2, IBC99; 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 TP3: For solids above melting point and hot liquids, maximum filling (%) is set by 4.2.1.9.5: 95 × dr/df. Portable tank provision TP29: A 1.5 bar minimum test pressure tank may be used if 1.5 bar or less is shown acceptable under 6.7.2.1. Tank code LGAV: ADR tank code for Classes 1 and 3–9: liquid tank, G (general minimum), openings A, valves/devices V. — L: tank for liquid-state substances (liquids, or solids handed over molten); 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; V: has a 6.8.2.2.6 breather device but no flame-propagation protection, or is not explosion-pressure-shock resistant Tank provision TU35: Empty uncleaned tanks that held these substances are not subject to ADR once adequate measures have removed any hazard. Tank provision TC7: Effective minimum shell thickness must be at least 3 mm. Tank provision TE6: Tanks may be fitted with a non-blocking device that prevents leakage and excess over- or under-pressure in the shell. Tank provision TE14: Insulation required; insulation touching the shell or heating parts must ignite at least 50 °C above the tank's maximum design temperature. Tank provision TE18: Tanks for substances filled above 190 °C need deflectors at right angles to the top filling openings. Tank provision TE24: Bitumen tanks with a spray bar may replace the 6.8.2.2.2 closing device by a shut-off valve on the discharge pipe ahead of the spray bar. 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, TP3, 4.2.5.3, TP29, 4.3.4.1.1, tank code LGAV, 4.3.5, TU35, 6.8.4 (a), TC7, 6.8.4 (b), TE6, 6.8.4 (b), TE14, 6.8.4 (b), TE18, 6.8.4 (b), TE24, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Bulk carriage VC3: Bulk carriage allowed in specially equipped vehicles or containers built to standards set by the country-of-origin authority. Bulk provision AP11: Sets the VC3 standards for molten aluminium (UN 3257) in vats: insulation ≤ 130 °C, steel vats tested at 4 bar, inspections, vehicles, driver training. (ADR 7.3.3.1, VC3, 7.3.3.2.7, AP11; 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 III

Tunnels
Tunnel code (D): in tanks, Prohibited in D, E; in other carriage, Prohibited in D, E. Categories A, B, C. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 3: at most 1000 per transport unit under 1.1.3.6, counted ×1 toward the 1,000-point limit (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 9 (Miscellaneous dangerous substances and articles) (ADR 5.2.2.2.2, label model No. 9; paraphrase, not yet reviewed)
Packing
Packing instruction P099: Only packagings approved for the goods by the competent authority; approval copy or a transport-document statement must accompany the load. Packing instruction IBC99: IBC99: only IBCs the competent authority has approved for the goods may be used, with proof of approval travelling with each consignment. (ADR 4.1.4.1, P099, 4.1.4.2, IBC99; 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 TP3: For solids above melting point and hot liquids, maximum filling (%) is set by 4.2.1.9.5: 95 × dr/df. Portable tank provision TP29: A 1.5 bar minimum test pressure tank may be used if 1.5 bar or less is shown acceptable under 6.7.2.1. Tank code LGAV: ADR tank code for Classes 1 and 3–9: liquid tank, G (general minimum), openings A, valves/devices V. — L: tank for liquid-state substances (liquids, or solids handed over molten); 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; V: has a 6.8.2.2.6 breather device but no flame-propagation protection, or is not explosion-pressure-shock resistant Tank provision TU35: Empty uncleaned tanks that held these substances are not subject to ADR once adequate measures have removed any hazard. Tank provision TC7: Effective minimum shell thickness must be at least 3 mm. Tank provision TE6: Tanks may be fitted with a non-blocking device that prevents leakage and excess over- or under-pressure in the shell. Tank provision TE14: Insulation required; insulation touching the shell or heating parts must ignite at least 50 °C above the tank's maximum design temperature. Tank provision TE24: Bitumen tanks with a spray bar may replace the 6.8.2.2.2 closing device by a shut-off valve on the discharge pipe ahead of the spray bar. 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, TP3, 4.2.5.3, TP29, 4.3.4.1.1, tank code LGAV, 4.3.5, TU35, 6.8.4 (a), TC7, 6.8.4 (b), TE6, 6.8.4 (b), TE14, 6.8.4 (b), TE24, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Bulk carriage VC3: Bulk carriage allowed in specially equipped vehicles or containers built to standards set by the country-of-origin authority. (ADR 7.3.3.1, VC3; 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 9 — Miscellaneous Dangerous SubstancesPacking Group III2 variants
UN 3257 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 3257Class 9 — Miscellaneous Dangerous SubstancesPG IIIVariant 1 of 2
ELEVATED TEMPERATURE LIQUID, N.O.S., at or above 100 °C and below its flash-point (including molten metals, molten salts, etc.), filled at a temperature higher than 190 °C
Packing Group
III
Low danger
Classification Code
M9
Tunnel Code
(D) meaning →
Code governing tunnel passage
Transport Category
3
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
99
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 3
×1 points per kg/L — up to 1,000 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
1,000 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 643, SP 668
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 9

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

Special Provisions
SP 274SP 643SP 668

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

UN 3257Class 9 — Miscellaneous Dangerous SubstancesPG IIIVariant 2 of 2
ELEVATED TEMPERATURE LIQUID, N.O.S., at or above 100 °C and below its flash-point (including molten metals, molten salts, etc.), filled at or below 190 °C
Packing Group
III
Low danger
Classification Code
M9
Tunnel Code
(D) meaning →
Code governing tunnel passage
Transport Category
3
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
99
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 3
×1 points per kg/L — up to 1,000 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
1,000 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 643, SP 668
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 9

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

Special Provisions
SP 274SP 643SP 668

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

Check if UN 3257 qualifies for 1.1.3.6 exemption
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All Class 9 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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