What type of hazard does Division 1.1 of Explosives signify?

Division 1.1 of Explosives signifies a blast hazard, which is characterized by an explosive substance that is capable of producing a mass explosion. This means that when an explosion occurs in this category, it has the potential to create a significant force and pressure wave that can affect a large area and cause severe damage and injury.

Understanding this classification is crucial for emergency responders, safety professionals, and those handling explosives, as it helps in assessing the risks involved and implementing appropriate safety measures. The emphasis is on the ability of the material to cause a blast that could endanger life and property.

The other options, while relevant to explosive materials, do not fully encapsulate the severity and characteristics of Division 1.1. They represent specific scenarios or hazards associated with explosions but do not reflect the primary concern of mass explosions that defines this classification.