A UN number is a four-digit identification code assigned to hazardous materials and dangerous goods for transport. It helps carriers, customs authorities, warehouses, and emergency responders quickly identify the type of dangerous substance being shipped, such as flammable liquids, corrosive materials, gases, explosives, or toxic chemicals. UN numbers are used on shipping documents, labels, safety data sheets, and dangerous goods declarations to support safe and compliant transport by road, sea, rail, or air.
A UN Number is a four-digit code assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods to identify hazardous substances and articles in international transport. UN numbers are part of the GHS hazardous materials classification system.
- Printed on dangerous goods labels and placards on packages and vehicles
- Required on dangerous goods declarations, MSDS, and shipping documents
- Each UN number corresponds to a specific hazardous material or class
- Used by emergency responders to identify hazards and response procedures
For related logistics context, see glossary entries on Hazmat, Dangerous Goods Surcharge, MSDS, and Cargo Insurance.
