Hazardous Cargo IMO Classes

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 *