UNnumbers

UN numbers are four-digit identification numbers assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods. These numbers are used to identify hazardous materials, such as explosives, flammables, toxins, and radioactive substances, during transportation. The UN number system is part of a broader set of regulations designed to ensure the safe and secure movement of dangerous goods by road, rail, sea, and air.

Each UN number is unique and corresponds to a specific substance or group of substances with similar hazardous properties. For example, UN 1203 refers to gasoline, while UN 1075 refers to petroleum gases, liquefied. The UN number is typically displayed on placards and labels affixed to the packaging and vehicles carrying the hazardous materials. This standardization allows for immediate recognition of the risks involved and facilitates appropriate emergency response in case of an incident.

The use of UN numbers is mandatory under various international and national regulations, including the UN Recommendations on the Transport of Dangerous Goods, the International Maritime Dangerous Goods (IMDG) Code, and the International Air Transport Association (IATA) Dangerous Goods Regulations. These regulations aim to harmonize the classification, packaging, marking, labeling, and documentation of dangerous goods to minimize the risks associated with their transport. The UN number is a critical element in this harmonized system, providing a universally recognized identifier for dangerous goods.