United Nations Number (UN Number)
United Nations Number (UN Number) :
A system of four digit numbers assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods. United Nations Numbers are assigned to one substance or to a group of substances with similar characteristics. They are not necessarily unique to one chemical, and may cover a group of chemicals with similar hazardous properties, for example, Organophosphorus pesticides, liquid, toxic United Nations No. 3018
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