One type of hazardous material that is classified as Department of Transportation Hazard Class 1.1 is:

One type of hazardous material that is classified as Department of Transportation Hazard Class 1.1 is:

• A. Spontaneously combustible materials
• B. Water reactive substances
• C. Oxidizing substances
• D. Explosives with a mass explosion hazard

Answer: (D)

Explosives classified as Hazard Class 1.1 are substances with a mass explosion hazard—a single initiating event could cause the entire load to detonate, producing a large blast that can affect an entire package or shipment. This is what the term “mass explosion hazard” conveys and is the defining feature of 1.1 explosives. Spontaneously combustible materials and water-reactive substances belong to other Class 4 subdivisions, not Class 1, so they don’t fit. Oxidizing substances are in Class 5.1 and are about promoting combustion, not being primary explosives. Therefore, the type described as explosives with a mass explosion hazard best fits Hazard Class 1.1.

Explosives classified as Hazard Class 1.1 are substances with a mass explosion hazard—a single initiating event could cause the entire load to detonate, producing a large blast that can affect an entire package or shipment. This is what the term “mass explosion hazard” conveys and is the defining feature of 1.1 explosives.

Spontaneously combustible materials and water-reactive substances belong to other Class 4 subdivisions, not Class 1, so they don’t fit. Oxidizing substances are in Class 5.1 and are about promoting combustion, not being primary explosives. Therefore, the type described as explosives with a mass explosion hazard best fits Hazard Class 1.1.