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 1: Explosives
Logo | Description |
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Division 1.1: Substances and articles which have a mass explosion hazard | |
Division 1.2: Substances and articles which have a projection hazard but not a mass explosion hazard | |
Division 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 | |
Division 1.4: Substances and articles which present no significant hazard | |
Division 1.5: Very insensitive substances which have a mass explosion hazard | |
Division 1.6: Extremely insensitive substances which do not have a mass explosion hazard |
Class 2: Gases
Logo | Description |
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Division 2.1: Flammable gases These are gases which will burn |
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Division 2.2: Non-flammable, non-toxic gases These gases are usually compressed and so are a source of stored energy and some may also preent an anoxic hazard (that is, they will exclude oxygen and so kill through asphyxiation). These containers may rocket if valves are damaged or containers are involved in a fire. |
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Division 2.3: Toxic gases These liquids will all burn. |
Class 3: Flammable liquids
Logo | Description |
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These liquids will all burn. |
Remarks: The numerical order of the classes and divisions is not that of the degree of danger.