Which Hazard Division HD is Mass-Explosion?

• A. 1.3
• B. 1.1
• C. 2.1
• D. 3.1

Answer: (B)

Mass explosion is when a single initiating event could detonate the entire amount of explosive, turning it into one huge blast that affects a wide area. This is the most severe hazard category for Class 1 explosives, meaning all charges can detonate almost simultaneously. Among the options, the description that matches this mass detonation potential is the one that indicates the entire load could explode together. The other options describe different hazards: one is a fire hazard related to explosives but not a mass detonation, another is a gas hazard, and the last refers to a different, non-mass-explosion hazard. So this choice is the best because it uniquely conveys the mass detonation risk.