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Classification

The responsibility for classifying dangerous goods lies with the person, organization, or government preparing the goods for shipment. Substances are classified according to the main threat they present.

Special rules apply for substances, mixtures, and solutions that carry multiple hazards. In general, the multiple-hazard good must be handled according to its most serious hazard. For example, in a shipment of a good that is both toxic and radioactive, the radioactivity will always be the primary hazard.

For the purpose of understanding, a class is a grouping of dangerous goods that share similar characteristics. There are nine classes. (There is also a classification of "n.o.s." which stands for "not otherwise specified.")

A division is a smaller group of substances within a class.

Some substances may be assigned a packing group, based on its danger level. The three packing groups are:

  • Packing Group I: High Danger
  • Packing Group II: Medium Danger
  • Packing Group III: Low Danger

Criteria for the packing groups are provided for Classes 3 and 4, Division 5.1, Division 6.1, and Class 8.

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