Division 1.5 refers to which hazard description?

Division 1.5 refers to which hazard description?

• A. Mass explosion hazard extremely insensitive (prilled ammonium nitrate with fuel)
• B. Extremely insensitive articles with no mass explosion hazard (squib)
• C. Projection hazard (aerial flares)
• D. Flammable gas at 68 degrees

Answer: (A)

Division 1.5 is for explosives that have a mass explosion hazard but are extremely insensitive to initiation. The example given—prilled ammonium nitrate with fuel—fits this description perfectly: it’s very unlikely to detonate easily, yet if it is initiated, it has the potential to produce a mass explosion. That combination of extreme insensitivity with a possible large-scale blast is the hallmark of Division 1.5. The other options point to different classifications: extremely insensitive with no mass explosion hazard would be Division 1.6; a projection hazard is Division 1.3; and a flammable gas at 68 degrees falls under Class 2, not Division 1.

Division 1.5 is for explosives that have a mass explosion hazard but are extremely insensitive to initiation. The example given—prilled ammonium nitrate with fuel—fits this description perfectly: it’s very unlikely to detonate easily, yet if it is initiated, it has the potential to produce a mass explosion. That combination of extreme insensitivity with a possible large-scale blast is the hallmark of Division 1.5. The other options point to different classifications: extremely insensitive with no mass explosion hazard would be Division 1.6; a projection hazard is Division 1.3; and a flammable gas at 68 degrees falls under Class 2, not Division 1.