What distinguishes a cast primer from other explosives?

A cast primer is distinguished from other explosives primarily by its unsensitized nature and its suitability for detonating other explosives. This feature enables it to act as a booster, initiating more sensitive explosives effectively when placed in contact with them. Cast primers often contain a high-density material that enhances their ability to transmit shock waves, making them ideal for use in a variety of blasting applications, particularly in mining where reliable detonation is crucial.

The unsensitized characteristic allows for safer handling and storage, as they do not detonate easily through friction or heat, which is a common risk with more sensitive explosives. This property is essential for ensuring safety in underground environments where conditions can be unpredictable. Being suited for initiating other explosives, cast primers play a vital role in the overall blasting sequence, ensuring that the main charge detonates as required.

The other choices describe features or uses that do not accurately represent the defining characteristics of cast primers. For instance, while some explosives may be used exclusively underground, this is not a unique attribute of cast primers. Similarly, resembling a traditional grenade in design does not apply, as cast primers are typically more standardized in form rather than shaped like grenades. Lastly, while cast primers can be used in demolition, their primary role is to initiate