UN 2031

NITRIC ACID, other than red fuming, with more than 70 % nitric acid

UN 2031 (variant 1 of 3, packing group I) — ADR 2025 Table A: class 8, classification code CO1, packing group I, labels 8 +5.1, special provisions —, limited quantity 0, excepted quantity E0, packing instructions P001, transport category 1, tunnel restriction code (E), hazard identification number 885.

UN 2031 (variant 2 of 3, packing group II) — ADR 2025 Table A: class 8, classification code CO1, packing group II, labels 8 +5.1, special provisions —, limited quantity 1 L, excepted quantity E2, packing instructions P001 IBC02, transport category 2, tunnel restriction code (E), hazard identification number 85.

UN 2031 (variant 3 of 3, packing group II) — ADR 2025 Table A: class 8, classification code C1, packing group II, labels 8, special provisions —, limited quantity 1 L, excepted quantity E2, packing instructions P001 IBC02, transport category 2, tunnel restriction code (E), hazard identification number 80.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 2031 — variant 1 of 3, packing group I
(1) UN No.2031
(2) Name and descriptionNITRIC ACID, other than red fuming, with more than 70 % nitric acid
(3a) Class8
(3b) Classification codeCO1
(4) Packing groupI
(5) Labels8 +5.1
(6) Special provisions—
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP001
(9a) Packaging: special packing provisionsPP81
(9b) Packaging: mixed packing provisionsMP8 MP17
(10) Portable tanks and bulk containers: instructionsT10
(11) Portable tanks and bulk containers: special provisionsTP2
(12) ADR tank: tank codeL10BH
(13) ADR tank: special provisionsTC6 TT1
(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 handlingCV24
(19) Special provisions for carriage: operationS14
(20) Hazard identification No.885
Table A — ADR 2025 (ECE/TRANS/352), UN 2031 — variant 2 of 3, packing group II
(1) UN No.2031
(2) Name and descriptionNITRIC ACID, other than red fuming, with at least 65 %, but not more than 70 % nitric acid
(3a) Class8
(3b) Classification codeCO1
(4) Packing groupII
(5) Labels8 +5.1
(6) Special provisions—
(7a) Limited quantities1 L
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP001 IBC02
(9a) Packaging: special packing provisionsPP81 B15
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT8
(11) Portable tanks and bulk containers: special provisionsTP2
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisionsTU42
(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 handlingCV24
(19) Special provisions for carriage: operation—
(20) Hazard identification No.85
Table A — ADR 2025 (ECE/TRANS/352), UN 2031 — variant 3 of 3, packing group II
(1) UN No.2031
(2) Name and descriptionNITRIC ACID, other than red fuming, with less than 65 % nitric acid
(3a) Class8
(3b) Classification codeC1
(4) Packing groupII
(5) Labels8
(6) Special provisions—
(7a) Limited quantities1 L
(7b) Excepted quantitiesE2
(8) Packaging: packing instructionsP001 IBC02
(9a) Packaging: special packing provisionsPP81 B15
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT8
(11) Portable tanks and bulk containers: special provisionsTP2
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisionsTU42
(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.80

ADR 2027 (accepted) — no change for UN 2031

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 (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 5.1 (Oxidizing substances) (ADR 5.2.2.2.2, label model No. 8, 5.2.2.2.2, label model No. 5.1; 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. Special packing provision PP81: UN 1790 (60–85 % HF) and UN 2031 (> 55 % nitric acid): plastics drums/jerricans as single packagings usable two years from manufacture. 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, 4.1.4.1, P001, PP81, 4.1.10.4, MP8, 4.1.10.4, MP17; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T10: Portable tank, Class 1 and 3–9: test 4 bar; shell 6 mm; relief See 6.7.2.8.3; 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). 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) Tank provision TC6: Tanks of aluminium at least 99 % pure or of aluminium alloy need walls no thicker than 15 mm, whatever 6.8.2.1.17 gives. Tank provision TT1: Pure aluminium tanks need initial and periodic hydraulic tests at only 250 kPa (2.5 bar) gauge. 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 T10, 4.2.5.3, TP2, 4.3.4.1.1, tank code L10BH, 6.8.4 (a), TC6, 6.8.4 (d), TT1, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Loading provision CV24: Clean the vehicle or container of combustible debris before loading; no readily flammable stowage material. Operation provision S14: Chapter 8.4 vehicle supervision applies for any amount of these substances. (ADR 7.5.11, CV24, 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 3, 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 5.1 (Oxidizing substances) (ADR 5.2.2.2.2, label model No. 8, 5.2.2.2.2, label model No. 5.1; 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. Special packing provision PP81: UN 1790 (60–85 % HF) and UN 2031 (> 55 % nitric acid): plastics drums/jerricans as single packagings usable two years from manufacture. Special packing provision B15: UN 2031 above 55 % nitric acid: rigid plastics IBCs and composite inner receptacles may be used for two years from manufacture. 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, 4.1.4.1, P001, PP81, 4.1.4.2, IBC02, B15, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T8: Portable tank, Class 1 and 3–9: test 4 bar; shell See 6.7.2.4.2; 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). 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 Tank provision TU42: Aluminium-alloy shells, lined or unlined, only if the substance has a pH from 5.0 to 8.0. 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 T8, 4.2.5.3, TP2, 4.3.4.1.1, tank code L4BN, 4.3.5, TU42, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage
Loading provision CV24: Clean the vehicle or container of combustible debris before loading; no readily flammable stowage material. (ADR 7.5.11, CV24; 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 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) (ADR 5.2.2.2.2, label model No. 8; 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. Special packing provision PP81: UN 1790 (60–85 % HF) and UN 2031 (> 55 % nitric acid): plastics drums/jerricans as single packagings usable two years from manufacture. Special packing provision B15: UN 2031 above 55 % nitric acid: rigid plastics IBCs and composite inner receptacles may be used for two years from manufacture. 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, 4.1.4.1, P001, PP81, 4.1.4.2, IBC02, B15, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T8: Portable tank, Class 1 and 3–9: test 4 bar; shell See 6.7.2.4.2; 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). 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 Tank provision TU42: Aluminium-alloy shells, lined or unlined, only if the substance has a pH from 5.0 to 8.0. 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 T8, 4.2.5.3, TP2, 4.3.4.1.1, tank code L4BN, 4.3.5, TU42, 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 I3 variants
UN 2031 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 2031Class 8 — Corrosive SubstancesPG IVariant 1 of 3
NITRIC ACID, other than red fuming, with more than 70 % nitric acid
Packing Group
I
High danger
Classification Code
CO1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
1
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
885
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
Hazard Labels Required
Label 8Label 5.1

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

UN 2031Class 8 — Corrosive SubstancesPG IIVariant 2 of 3
NITRIC ACID, other than red fuming, with at least 65 %, but not more than 70 % nitric acid
Packing Group
II
Medium danger
Classification Code
CO1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
85
Kemler code
Limited Quantity
1 L
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
1 L
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
Hazard Labels Required
Label 8Label 5.1

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

UN 2031Class 8 — Corrosive SubstancesPG IIVariant 3 of 3
NITRIC ACID, other than red fuming, with less than 65 % nitric acid
Packing Group
II
Medium danger
Classification Code
C1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
80
Kemler code
Limited Quantity
1 L
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
1 L
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
Hazard Labels Required
Label 8

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

Check if UN 2031 qualifies for 1.1.3.6 exemption
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Other Corrosive Substances near UN 2031 (Class 8)

UN 2028
BOMBS, SMOKE, NON-EXPLOSIVE with…
UN 2029
HYDRAZINE, ANHYDROUS
UN 2030
HYDRAZINE AQUEOUS SOLUTION, with…
UN 2032
NITRIC ACID, RED FUMING
UN 2033
POTASSIUM MONOXIDE
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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