Final answer:
The class and division that describe a projection hazard but not a mass explosion hazard is Class 1.3 according to the UN system for the classification of explosives. Division 1.3 explosives have a significant risk of throwing fragments at high speeds when they burn rapidly, as opposed to a mass explosion that would affect the entire load instantaneously.
Step-by-step explanation:
The class and division you are referring to is Class 1.3 in the context of hazardous materials, specifically explosives. These materials are defined as those that have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard. This classification is a part of the UN system for the classification of explosives.
Explosives are categorized into different divisions to determine the kind of hazard they present. A mass explosion hazard, which is classified under Division 1.1, involves an explosive that can affect almost the entire load instantaneously. In contrast, projection hazards but not mass explosion hazards that are found in Division 1.3, typically burn very rapidly and pose a significant risk of throwing fragments around at high speeds, without the entire load detonating at once.
This classification is important in the transportation and storage of hazardous materials. It affects how these materials are handled, packaged, and transported to ensure safety and prevent accidents. For instance, explosives classified under Division 1.3 must be stored in a way that minimizes the risk of projectiles, and transportation regulations may limit the quantity that can be transported together.
Understanding these classification divisions can help in managing the risks associated with explosives, and ensure that proper safety protocols are in place.