How do UN numbers and proper shipping names relate to labeling and packaging?

• A. The labeling and packaging are independent of UN numbers.
• B. The UN number identifies the material and corresponds to a specific proper shipping name and hazard class; labeling and packaging must match both.
• C. Labeling is sufficient; UN numbers are optional.
• D. Proper shipping name is determined by the carrier, not by UN number.

Answer: (B)

UN numbers act as unique identifiers for hazardous materials in transport. Each UN number maps to a specific proper shipping name and hazard class (and packing group when applicable). Because of that mapping, the labeling on a package and its packaging requirements must reflect both the UN number and the associated proper shipping name and hazard class. This alignment ensures clear communication of the material’s hazards to everyone handling or responding to an incident, and it keeps shipping, labeling, and packaging consistent across modes. The proper shipping name isn’t set by the carrier; it’s standardized and tied to the UN number so misalignment would cause confusion and noncompliance.