Which type of Hazardous explosive material must show its division on the hazmat label?

Explosive materials classified as Division 1.1, 1.2, or 1.3 must display their division on the hazmat label. These divisions indicate the level of risk associated with the explosive, with 1.1 being the highest risk due to the potential for mass explosion. Proper labeling is crucial for safety during transportation and handling to ensure that emergency responders are aware of the hazards.