UN Number Guide is a mobile app that allows you to quickly and conveniently find the UN number of a chemical or its derivative, or the name of the substance.

This app allows you to search the United Nations' Chemical Safety Database by entering the UN number, the chemical name, or its derivative. You can search by compound, by element, or by category.

UN Number Guide also allows you to look up the substance's class, its symbol, and its chemical formula.

You can also look up the substance's SI unit of measurement, the SMCL code, and the year of its first occurrence.

The app is designed to be used by firemen, emergency medical technicians, and other first responders who need to know the chemical name of a hazardous material they are dealing with in order to take the necessary precautions.