UN Number (United Nations Number) is a four-digit code used to identify hazardous substances and articles in international transport.

Definition: A unique identifier assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods.

Purpose: To standardize the identification of hazardous materials, ensuring consistency in labeling, handling, and emergency response procedures across international borders.

Usage:

Shipping Documentation: Included in shipping documents, labels, and placards to identify dangerous goods.

Safety and Compliance: Helps in adhering to regulations regarding the transportation, storage, and handling of hazardous materials.

Examples:

UN 1203: Gasoline

UN 1993: Flammable liquids, n.o.s. (not otherwise specified)

UN 2814: Infectious substances, affecting humans