UN Number 4
UN Number 4 : United Nations substance numbers are four-digit numbers, which have been assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods, to individual substances (e.g. sulphuric acid) or groups of similar substances (e.g. carbamate pesticides). The numbers are primarily intended to facilitate the identification of substances without the need for a knowledge of the language in which the chemical name is printed. They have also proved to be of great value for emergency services in the correct relaying of long or complex names of substances, thus allowing error-free identification
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