What does "UN number" signify?

The UN number, also known as the United Nations number, is a four-digit identifier specifically assigned to hazardous substances and articles to facilitate their transport. It serves as a critical component in the international transportation of dangerous goods by providing a standardized way to identify the materials being transported. Each UN number corresponds to a specific substance or group of substances that share similar hazardous characteristics, making it easier for transporters, emergency responders, and regulatory authorities to assess and manage risks associated with the material.

For instance, knowing the UN number allows carriers and response teams to quickly access the relevant safety data and handling instructions, ensuring compliance with safety regulations and effective emergency response during incidents involving hazardous materials. This standardized identification is vital in preventing accidents and ensuring safe handling throughout the supply chain.