UN 3301

CORROSIVE LIQUID, SELF-HEATING, N.O.S.

UN 3301 (variant 1 of 2, packing group I) — ADR 2025 Table A: class 8, classification code CS1, packing group I, labels 8 +4.2, special provisions 274, limited quantity 0, excepted quantity E0, packing instructions P001, transport category 1, tunnel restriction code (E), hazard identification number 884.

UN 3301 (variant 2 of 2, packing group II) — ADR 2025 Table A: class 8, classification code CS1, packing group II, labels 8 +4.2, special provisions 274, limited quantity 0, excepted quantity E2, packing instructions P001, transport category 2, tunnel restriction code (E), hazard identification number 84.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 3301 — variant 1 of 2, packing group I
(1) UN No.3301
(2) Name and descriptionCORROSIVE LIQUID, SELF-HEATING, N.O.S.
(3a) Class8
(3b) Classification codeCS1
(4) Packing groupI
(5) Labels8 +4.2
(6) Special provisions274
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP001
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP8 MP17
(10) Portable tanks and bulk containers: instructions—
(11) Portable tanks and bulk containers: special provisions—
(12) ADR tank: tank codeL10BH
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)1 (E)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operationS14
(20) Hazard identification No.884
Table A — ADR 2025 (ECE/TRANS/352), UN 3301 — variant 2 of 2, packing group II
(1) UN No.3301
(2) Name and descriptionCORROSIVE LIQUID, SELF-HEATING, N.O.S.
(3a) Class8
(3b) Classification codeCS1
(4) Packing groupII
(5) Labels8 +4.2
(6) Special provisions274
(7a) Limited quantities0
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP001
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructions—
(11) Portable tanks and bulk containers: special provisions—
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (E)
(16) Special provisions for carriage: packages—
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handling—
(19) Special provisions for carriage: operation—
(20) Hazard identification No.84

ADR 2027 (accepted) — no change for UN 3301

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 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 8 (Corrosive substances), model 4.2 (Substances liable to spontaneous combustion) (ADR 5.2.2.2.2, label model No. 8, 5.2.2.2.2, label model No. 4.2; 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. Mixed packing provision MP8: Up to 3 litres per inner packaging may be mixed with same-class goods of other classification codes or with non-ADR goods. Mixed packing provision MP17: Up to 0.5 litre per inner and 1 litre per package may be mixed with other classes (not Class 7) that permit it, or with non-ADR goods. (ADR 4.1.4.1, P001, 4.1.10.4, MP8, 4.1.10.4, MP17; paraphrase, not yet reviewed)
Tanks
Tank code L10BH: ADR tank code for Classes 1 and 3–9: liquid tank, 10 bar, openings B, 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); B: filling or discharge openings at the bottom, each with 3 closures; H: hermetically closed (see 1.2.1) 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 4.3.4.1.1, tank code L10BH, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Operation provision S14: Chapter 8.4 vehicle supervision applies for any amount of these substances. (ADR 8.5, S14; 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 (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 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 8 (Corrosive substances), model 4.2 (Substances liable to spontaneous combustion) (ADR 5.2.2.2.2, label model No. 8, 5.2.2.2.2, label model No. 4.2; 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. 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, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Tank code L4BN: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings B, valves/devices N. — 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); B: filling or discharge openings at the bottom, each with 3 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 4.3.4.1.1, tank code L4BN, 9.1.1.2, AT vehicle; 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 8 — Corrosive SubstancesPacking Group I2 variants
UN 3301 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 3301Class 8 — Corrosive SubstancesPG IVariant 1 of 2
CORROSIVE LIQUID, SELF-HEATING, N.O.S.
Packing Group
I
High danger
Classification Code
CS1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
1
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
884
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
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 8Label 4.2

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 3301Class 8 — Corrosive SubstancesPG IIVariant 2 of 2
CORROSIVE LIQUID, SELF-HEATING, N.O.S.
Packing Group
II
Medium danger
Classification Code
CS1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
84
Kemler code
Limited Quantity
0
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
Not permitted
No limited-quantity relief for this entry (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 8Label 4.2

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 3301 qualifies for 1.1.3.6 exemption
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Other Corrosive Substances near UN 3301 (Class 8)

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All Class 8 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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