| IMO Class |
Description |
| Class 1 |
Explosives |
| 1.1 |
Substances and articles which have a mass explosion hazard. |
| 1.2 |
Substances and articles which have a projection hazard but not a mass explosion hazard. |
| 1.3 |
Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard. |
| 1.4 |
Substances and articles which present no significant hazard. |
| 1.5 |
Very insensitive substances which have a mass explosion hazard. |
| 1.6 |
Extremely insensitive articles which do not have a mass explosion hazard. |
| Class 2 |
Gases: Compressed, Liquefied or Dissolved under Pressure |
| 2.1 |
Flammable gases |
| 2.2 |
Non-Flammable gases |
| 2.3 |
Toxic gases |
| Class 3 |
Flammable Liquids |
| Class 4 |
Flammable Solids or Substances |
| 4.1 |
Flammable solids |
| 4.2 |
Substances liable to spontaneous combustion |
| 4.3 |
Substances which, in contact with water, emit flammable gases. |
| Class 5 |
Oxidizing Substances (agents) and Organic Peroxides |
| 5.1 |
Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire |
| 5.2 |
Organic peroxides - most will burn rapidly and are sensitive to impact or friction |
| Class 6 |
Toxic and infectious Substances |
| 6.1 |
Toxic substances |
| 6.2 |
Infectious substances |
| Class 7 |
Radioactive Substances |
| Class 8 |
Corrosives |
| Class 9 |
Miscellaneous dangerous substances and articles * |
| MHB |
Materials hazardous only in bulk ** |
| * |
Marine pollutants which are not of an otherwise dangerous nature are listed in class 9 |
| ** |
The regulations for materials hazardous only in bulk are not applicable to these materials when they are carried in closed freight containers, however, many precautions may have to be observed |
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