UN 1787

HYDRIODIC ACID

Class 8 — Corrosive SubstancesPacking Group II2 variants
UN 1787 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 1787Class 8 — Corrosive SubstancesPG IIVariant 1 of 2
HYDRIODIC 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.

UN 1787Class 8 — Corrosive SubstancesPG IIIVariant 2 of 2
HYDRIODIC ACID
Packing Group
III
Low danger
Classification Code
C1
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
3
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
80
Kemler code
Limited Quantity
5 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 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
5 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
Hazard Labels Required
Label 8

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

Check if UN 1787 qualifies for 1.1.3.6 exemption
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ADR 2027 (accepted)

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)

The ADR 2027 amendments (ECE/TRANS/WP.15/274, ECE/TRANS/WP.15/274/Add.1, ECE/TRANS/WP.15/274/Corr.1) make no change to this entry's Table A columns. 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 →

Other Corrosive Substances near UN 1787 (Class 8)

UN 1784
HEXYLTRICHLOROSILANE
UN 1786
HYDROFLUORIC ACID AND SULPHURIC …
UN 1788
HYDROBROMIC ACID
UN 1789
HYDROCHLORIC ACID
UN 1790
HYDROFLUORIC ACID with more than…
All Class 8 UN numbers →
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📅Data: UNECE ADR 2025 (ECE/TRANS/352), via EU Directive 2008/68/EC. Last verified August 2026

ADR reference data only. Classification is the consignor's legal responsibility. Consult a DGSA for compliance decisions.

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