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DG CLASS

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
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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
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Division 2.1: Flammable gases
These are gases which will burn
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.
Division 2.3: Toxic gases
These liquids will all burn.
Class 3: Flammable liquids
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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.