In dangerous goods labeling, what does PSN stand for and what must accompany it on outer packaging?

• A. Proper Shipping Name; the UN number must accompany it on the outer packaging
• B. Production Serial Number; no UN number required
• C. Packing Standard Notation; hazard labels only
• D. Primary Shipping Number; only the hazard class is required

Answer: (A)

The essential idea is that the exact shipping name used for dangerous goods and the UN number work together to uniquely identify the material on outer packaging. PSN stands for Proper Shipping Name, the standardized name the transport regulations use to identify the substance or article. The UN number is a four-digit code that identifies the specific material and links to the PSN in the regulatory tables. On the outer packaging, these two pieces of information must appear together so anyone handling, shipping, or responding to an incident can immediately recognize what’s inside and apply the correct safety measures. The other options don’t fit because the terms listed aren’t used in dangerous goods labeling, and they don’t correspond to the requirement for pairing a Proper Shipping Name with the UN number on packaging.