Which term describes asbestos materials that can easily crumble into dust?

The term that describes asbestos materials that can easily crumble into dust is "friable." Friable asbestos refers to any material that can be reduced to powder by hand pressure. This characteristic is significant because when asbestos becomes friable, it can release asbestos fibers into the air, posing serious health risks when inhaled.

In contrast, non-friable asbestos is more stable and cannot easily be broken down into dust. Therefore, it typically poses a lower risk if intact and undisturbed. Terms like "thermal" and "insulating" refer to the types and functions of asbestos materials, rather than their physical properties regarding their friability. Understanding this distinction is crucial for recognizing the potential hazards associated with handling and working with asbestos in various environments.