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Substances, including mixtures and solutions, and articles are assigned to one of nine classes according to the hazard or the most predominant of the hazards they pose in transport. Some of the classes are divided into divisions. These classes and divisions are:

Class 4: Flammable solids; substances liable to spontaneous combustion;substances which, on contact with water, emit flammable gases
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Division 4.1: Flammable solids
Division 4.2: Substances liable to spontaneous combustion
Division 4.3: Substances which, on contact with water, emit flammable gases
Class 5: Oxidizing substances and organic peroxides
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Division 5.1: Oxidizing substances
Division 5.2: Organic peroxides
Class 6: Toxic and infectious substances
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Division 6.1: Toxic substances
Division 6.2: Infectious substances
Remarks: The numerical order of the classes and divisions is not that of the degree of danger.