What are the two major groups into which high explosives (HE) are classified?

The classification of high explosives into primary and secondary explosives is fundamental in understanding their characteristics and uses. Primary explosives are materials that are sensitive to heat, shock, or friction, making them capable of detonation under relatively low-energy conditions. These explosives are often used in detonators and initiating devices. On the other hand, secondary explosives are less sensitive and typically require a high-energy detonation source to explode. They are more stable during handling and storage and are commonly used in military munitions and commercial blasting.

This classification is crucial in the field of hazardous materials as it influences safety protocols, handling procedures, and storage requirements. By comprehending the distinction between primary and secondary explosives, personnel can effectively manage the risks associated with these materials and ensure safer transportation and usage.