What are sheathed type explosives?

Sheathed type explosives refer specifically to gel-type permissible explosives that are designed to be safe under various conditions where traditional explosives might pose a risk. The "gel" aspect indicates that these explosives have a consistency that can help manage their stability and performance, while the designation of "permissible" suggests that they are engineered to mitigate certain hazards, particularly in underground mining environments.

These explosives are formulated to resist unintended ignition, especially in atmospheres with flammable gases or dust, making them suitable for use in more hazardous areas compared to other explosive types. This characteristic is essential in mining operations, where safety is paramount and the potential for ignition from less stable explosives would pose a significant risk to workers and operations.

In contrast, the other options refer to different categories or characteristics of explosives that do not capture the specific nature and applications of sheathed type explosives effectively, highlighting the importance of understanding the nuances in explosive classifications for safe mining practices.