UN 1790 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 1790Class 8 — Corrosive SubstancesPG IVariant 1 of 3
HYDROFLUORIC ACID with more than 85 % hydrogen fluoride
- Packing Group
- I
- High danger
- Classification Code
- CT1
- Tunnel Code
- (C/D) meaning →
- Code governing tunnel passage
- Transport Category
- 1
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 886
- 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 640I
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 8Label 6.1
These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.
Special Provisions
SP 640I
Refer to ADR 2025 Chapter 3.3 for full text of each provision.
UN 1790Class 8 — Corrosive SubstancesPG IVariant 2 of 3
HYDROFLUORIC ACID with more than 60 % but not more than 85 % hydrogen fluoride
- Packing Group
- I
- High danger
- Classification Code
- CT1
- Tunnel Code
- (C/D) meaning →
- Code governing tunnel passage
- Transport Category
- 1
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 886
- 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 640J
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 8Label 6.1
These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.
Special Provisions
SP 640J
Refer to ADR 2025 Chapter 3.3 for full text of each provision.
UN 1790Class 8 — Corrosive SubstancesPG IIVariant 3 of 3
HYDROFLUORIC ACID with not more than 60 % hydrogen fluoride
- Packing Group
- II
- Medium danger
- Classification Code
- CT1
- Tunnel Code
- (E) meaning →
- Code governing tunnel passage
- Transport Category
- 2
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 86
- 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 6.1
These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.
Check if UN 1790 qualifies for 1.1.3.6 exemption
Calculate small load points and check exemption thresholds
Other Corrosive Substances (Class 8)
📅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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