Which hazard class has no divisions?

Class 7 is designated for radioactive materials, and it is unique among the hazard classes because it does not have any subdivisions or divisions. This classification reflects the specific nature of radioactive materials and the regulatory framework governing their transportation. The absence of divisions simplifies the compliance and regulatory aspects for shippers and carriers, as they must follow the stipulations for Class 7 as a whole, without needing to navigate further subdivisions.

In contrast, other classes such as Class 5 (oxidizers and organic peroxides), Class 8 (corrosive materials), and Class 9 (miscellaneous dangerous goods) do have subdivisions that provide a more detailed categorization of the materials within those classes. This additional classification helps to establish more specific handling, labeling, and shipping requirements based on the properties and risks associated with those materials.