Which storage compatibility group includes initiating explosives such as lead azide and PETN?

The storage compatibility group that includes initiating explosives such as lead azide and PETN is Group A. This group is specifically designated for sensitive explosives that can initiate detonation or function as primary explosives. These materials are known for their sensitivity to heat, shock, and friction, which necessitates strict storage guidelines to prevent unintended detonations.

Understanding the nature of these explosives is essential for safe handling and storage. Group A explosives are often employed in applications where they serve as initiators for other explosive materials, highlighting the need for careful control over their storage conditions to minimize risk.

In contrast, the other groups, B, C, and D, contain different types of explosives that do not have the same sensitivity or risk factors as those found in Group A. Each of these groups has specific regulations and best practices tailored to the characteristics of the materials they encompass, ensuring safe transportation and storage in hazardous materials management.