Which labeling is required on HazMat packages that have subsidiary hazard classes?

• A. A Primary Hazard Label and a Hazard Label for all Subsidiary Hazard Classes.
• B. Only a Primary Hazard Label.
• C. Hazard Placards only.
• D. No label is required.

Answer: (A)

When a hazmat package has subsidiary hazard classes, you must display both the primary hazard label and a label for every subsidiary hazard class present. The primary label communicates the main danger, while each subsidiary label communicates the secondary risks. This ensures anyone handling the package, or responding to an incident, can quickly understand all hazards.

For example, if a package is primarily a flammable liquid but also presents a toxic subsidiary hazard, you would place the primary flammable label plus a label for the toxic hazard. Hazard placards are used on vehicles or large shipments, not on individual packages, and omitting the subsidiary labels would miss important risk information.