IMO Classes and Labels

IMO Class

IMO 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


Class 9

Miscellaneous dangerous substances and articles *


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


IMO Labels

Explosive Explosive Flammable Gas Non-flammable Compressed Gas
Toxic Gas Flammable Liquid Flammable Solid Spontaneously Combustible
Dangerous When Wet Oxidizing Agent Organic Peroxide Toxic
Infectious Substance Radioactive Radioactive Radioactive
Radioactive Corrosive Marine Pollutant Miscellaneous