Which hazard class division corresponds to mass fire?

• A. 1.2
• B. 1.3
• C. 1.4
• D. 1.1

Answer: (B)

Hazards are categorized by how the danger presents itself. A mass explosion hazard means a single initiation could cause a large portion of the material to explode violently and catastrophically. A projection hazard involves fragments being thrown outward. A fire hazard describes a scenario where a large fire can occur without a mass detonation. A minor explosion or blast hazard covers very small, contained explosions.

The term “mass fire” points to a significant fire risk without a mass explosion, so it fits the fire hazard division. That’s why this option is the best answer. The other options describe projection, a minor blast, or a mass explosion, which do not match a mass fire scenario.