Hazmat Division 1.5 poses what hazard?

• A. Mass explosion hazard but are so insensitive that there is little probability of detonation under normal conditions
• B. Extremely insensitive detonating substances that demonstrate negligible probability of accidental propagation
• C. Projection Hazard
• D. Fire Hazard

Answer: (A)

This category describes materials that have a mass explosion hazard but are so insensitive that detonation is very unlikely under normal handling. The key idea is that there’s a potential for a large explosion if initiation occurs, but the probability of initiation is extremely low because the substance is highly insensitive. That combination—mass explosion potential combined with extreme insensitivity—is what defines this grouping.

The other statements refer to different hazards: one describes extremely insensitive detonating substances with negligible probability of accidental propagation, which is a separate, more insensitive subgroup; another mentions a projection hazard, which is a different explosive hazard scenario; and fire hazard, while important, is not the defining hazard of this category.