What is the purpose of UN numbers on packaging for lithium batteries?

• A. To indicate the device model
• B. To designate the dangerous goods class and handling requirements
• C. To determine shipping cost
• D. To identify the shipper's tax status

Answer: (B)

UN numbers act as the transport hazard code for dangerous goods. They convey exactly what kind of hazard the item is and what safety rules apply to its handling and shipping. For lithium batteries, this means the number tells you the specific class of danger and the required procedures for packaging, labeling, quantity limits, and emergency response. That shared, standardized information helps everyone in the supply chain—from shippers and carriers to inspectors and emergency responders—identify the risk quickly and apply the correct safety measures. So the core purpose is to designate the dangerous goods class and the handling requirements.

This isn’t about identifying a device model, calculating shipping costs, or determining tax status, which is why those options don’t fit.