The UN number, also a substance number, is a unique designation of substances and dangerous goods. It consists of four digits, which are established by the United Nations Central Committee to ensure international recognition and use.
Brief description
UN numbers are not issued only for individual chemicals, but also for groups of substances with similar hazard potential. They are usually on hazard placards that are placed on vehicles during transport. This information is extremely important for emergency services to quickly determine a substance's hazard potential in accidents with hazardous materials and to put in place the proper handling.
Examples
To highlight the use of UN numbers, we present the following examples:
UN 1203 - gasoline, hazard class 3
UN 2915 - radioactive substances, hazard class 7
UN 0323 - cartridges for technical purposes, hazard class 1.4 S
UN 1950 - pressurized packaging (aerosol), class 2
UN 2814 - substances infectious to humans, class 6.2
