Class 4 Dangerous Goods – Substances Liable To Spontaneous Combustion; Substances Which Emit Flammable Gases When In Contact With Water

Dangerous Goods which are classed flammable solids are materials which, under conditions encountered in transport, are readily combustible or may cause or contribute to fire through friction, self-reactive substances which are liable to undergo a strongly exothermic reaction or solid desensitised explosives.

Also included are substances which are liable to spontaneous heating under normal transport conditions, or to heating up in contact with air, and are consequently liable to catch fire and substances which emit flammable gases or become spontaneously flammable when in contact with water.


4.1: Flammable solids.

4.2: Substances liable to spontaneous combustion.

4.3: Substances which, in contact with water, emit flammable gases.

Reason For Regulation

Flammable solids are capable of posing serious hazards due to their volatility, combustibility and potential in causing or propagating severe conflagrations.

Commonly Transported Flammable Solids; Spontaneous Combustibles And ‘Dangerous When Wet’ Materials

  1. Alkali metals
  2. Metal powders
  3. Aluminium phosphide
  4. Sodium batteries
  5. Sodium cells
  6. Firelighters
  7. Matches
  8. Calcium carbide
  9. Camphor
  10. Carbon
  11. Activated carbon
  12. Celluloid
  13. Cerium
  14. Copra
  15. Seed cake
  16. Oily cotton waste
  17. Desensitised explosives
  18. Oily fabrics
  19. Oily fibres
  20. Ferrocerium
  21. Iron oxide (spent)
  22. Iron sponge/direct-reduced iron (spent)
  23. Metaldehyde
  24. Naphthalene
  25. Nitrocellulose
  26. Phosphorus
  27. Sulphur

Classifications of all dangerous goods can be found HERE

For more information on our ADR dangerous goods service please feel free to CONTACT US

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