Among the hazard class divisions described, which one represents the possibility of a mass explosion?

• A. 1.4
• B. 1.3
• C. 1.2
• D. 1.1

Answer: (D)

Mass explosion hazard is the term used for a situation where an initiating event can produce a blast that involves the entire charge or a large portion of the shipment, causing widespread destruction or casualties. This is classified as Class 1.1. It’s different from the other Class 1 divisions: the projection hazard (1.2) focuses on fragmentation and projectiles rather than a full-blast expanse; the fire hazard (1.3) involves significant fire and related effects but not a mass detonation of the whole contents; and the minor explosion hazard (1.4) involves only local, limited effects with little potential for widespread damage. So the one that specifically represents the possibility of a mass explosion is the category assigned to 1.1.