UN 2813 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 2813Class 4.3 — Flammable SolidsPG IVariant 1 of 3
WATER-REACTIVE SOLID, N.O.S.
- Packing Group
- I
- High danger
- Classification Code
- W2
- Tunnel Code
- (B/E) meaning →
- Code governing tunnel passage
- Transport Category
- 0
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- X423
- 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 0
Never exempt — any quantity requires full ADR compliance
Per-substance max
0 kg/L
Per-substance maximum (1.1.3.6.3) — Category 0 is never exempt
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 4.3
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 2813Class 4.3 — Flammable SolidsPG IIVariant 2 of 3
WATER-REACTIVE SOLID, N.O.S.
- Packing Group
- II
- Medium danger
- Classification Code
- W2
- Tunnel Code
- (D/E) meaning →
- Code governing tunnel passage
- Transport Category
- 0
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 423
- Kemler code
- Limited Quantity
- 500 g
- 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 0
Never exempt — any quantity requires full ADR compliance
Per-substance max
0 kg/L
Per-substance maximum (1.1.3.6.3) — Category 0 is never exempt
Limited Quantity
500 g
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
Special Provisions
SP 274
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 4.3
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 2813Class 4.3 — Flammable SolidsPG IIIVariant 3 of 3
WATER-REACTIVE SOLID, N.O.S.
- Packing Group
- III
- Low danger
- Classification Code
- W2
- Tunnel Code
- (E) meaning →
- Code governing tunnel passage
- Transport Category
- 0
- For the 1,000-point rule (0 = highest restriction)
- Hazard ID No.
- 423
- Kemler code
- Limited Quantity
- 1 kg
- 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 0
Never exempt — any quantity requires full ADR compliance
Per-substance max
0 kg/L
Per-substance maximum (1.1.3.6.3) — Category 0 is never exempt
Limited Quantity
1 kg
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
Special Provisions
SP 274
May alter scope or limits — full text in ADR 2025 Chapter 3.3
Hazard Labels Required
Label 4.3
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 2813 qualifies for 1.1.3.6 exemption
Calculate small load points and check exemption thresholds
Other Flammable Solids (Class 4)
📅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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