UN 3299Class 2 — Gases
- Packing Group
- N/A
- Not applicable
- Classification Code
- 2A
- Transport Category
- 3
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 20
- Kemler code
- Limited Quantity
- 120 ml
- 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
120 ml
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)
Special Provisions
SP 392, SP 662
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 2.2
These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.
Special Provisions
SP 392SP 662
Refer to ADR 2025 Chapter 3.3 for full text of each provision.