Dangerous goods
Dangerous Goods Class 4.3 — Dangerous When Wet
Last updated: 6 Jul 2026Reviewed by Ms. Rubab Nizami, Lead AVSEC Faculty
In short
Dangerous-goods Class 4.3 is dangerous when wet. Substances that give off flammable gas when they contact water, such as sodium and calcium carbide. Its hazard label is a blue diamond showing a flame.
- Class
- 4.3
- Label colour
- Blue
- Symbol
- Flame
- Passenger baggage
- Forbidden in passenger baggage.
What are examples of Class 4.3?
Examples include UN 1428 Sodium, UN 1402 Calcium carbide. Substances that give off flammable gas when they contact water, such as sodium and calcium carbide.
How is Class 4.3 handled and labelled?
Keep dry; the label is a blue diamond with a flame — not orange. For passengers: forbidden in passenger baggage.