Which condition is indicative of friable asbestos material?

Friable asbestos material is characterized by its ability to be crumbled, pulverized, or reduced to powder with relatively little pressure, particularly when dry. This means that if you can crush the material with hand pressure, it is indicative of its friable nature. Friable asbestos poses a higher risk for airborne fibers because it can easily release asbestos particles into the air during disturbances, leading to potential inhalation hazards.

The other conditions listed do not align with the definition of friable asbestos. A solid and unchanging structure suggests a material that is stable and not easily disrupted, which is contrary to the characteristics of friable asbestos. A low level of asbestos content does not determine whether a material is friable; instead, it focuses on the amount of asbestos present, which may or may not impact its friability. Lastly, a highly durable and resistant material implies strength and stability, typically associated with non-friable asbestos, which is less likely to release fibers into the air under normal conditions. Therefore, the ability to crush the material by hand pressure clearly indicates its friability.