After determining a material is hazardous, which step comes next?

• A. Select the Proper Shipping Name.
• B. Assign Primary & Subsidiary Hazard Class(es) (Precedence Table).
• C. Determine if material is listed by name.
• D. Determine packing group.

Answer: (B)

The next step is to assign the material’s hazard class(es) using the Precedence Table, determining which is the primary hazard and which are subsidiary hazards. This establishes how the material should be treated for transport. The primary hazard class is the main risk that drives packaging, labeling, and the way the material is described on shipping papers, while subsidiary hazards note any additional risks that must be communicated.

Once those classes are set, you use them to decide the proper shipping name (and whether a listed naming applies) and, if applicable, the packing group. Those steps depend on knowing the hazard class, so they come after establishing the primary and subsidiary hazards.