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Four digits, often on an orange plate.
Also known as: Dangerous goods number, Orange plate number, Substance identification number, UN transport number
A UN number identifies a dangerous good for transport, and it is what emergency services read off a tanker to know what they are dealing with. It identifies the hazard class of the substance for transport purposes and is not a chemical identifier — several substances can share one.
Denotes a four-digit identifier assigned to a dangerous substance or article for transport under the UN Model Regulations.
Contexts: Laboratory
Is displayed on an orange rectangular plate on vehicles and containers, above a hazard identification number.
Contexts: Laboratory
Identifies a transport entry rather than a compound: a single UN number may cover a group of related substances.
Contexts: Laboratory
Four digits printed in black on a rectangular orange plate, below a second two- or three-digit number.