On a hazardous materials placard, what does the number at the bottom of the diamond indicate?

On a hazardous materials placard, what does the number at the bottom of the diamond indicate?

• A. UN Hazard Class
• B. Hazardous Materials ID
• C. Packaging Group
• D. Emergency Response Guide Number

Answer: (A)

The bottom number on a hazmat placard is the UN identification number (Hazardous Materials ID). This four-digit code identifies the specific material and is used to look up the correct response information in the Emergency Response Guidebook. The hazard class is indicated by the pictogram and color bands on the placard, not by this bottom number. Packaging group isn’t shown on placards, and the Emergency Response Guide Number is a separate reference, not the bottom digits themselves.

The bottom number on a hazmat placard is the UN identification number (Hazardous Materials ID). This four-digit code identifies the specific material and is used to look up the correct response information in the Emergency Response Guidebook. The hazard class is indicated by the pictogram and color bands on the placard, not by this bottom number. Packaging group isn’t shown on placards, and the Emergency Response Guide Number is a separate reference, not the bottom digits themselves.