In the Hazardous Materials Table, what information does column 4 provide?

Column 4 of the Hazardous Materials Table provides the hazardous material identification number (also known as the UN number). This number is critical for identifying specific hazardous materials during transport. It is a four-digit code assigned by the United Nations that helps to standardize the identification of hazardous substances across international borders. This information is essential for emergency responders, transporters, and anyone handling these materials, as the ID number indicates the specific potential dangers associated with the material, allowing for informed handling, storage, and emergency procedures.