What would NOT be considered a sign of physical injury in friable ACM?

Color changes in friable asbestos-containing material (ACM) do not necessarily indicate physical injury or damage. While visual alterations in color might signal that something has changed in the material, those changes could be due to environmental factors, such as exposure to heat or chemicals, rather than direct mechanical damage or degradation.

In contrast, blistering, water damage, and flaking are more direct indicators of structural compromise. Blistering suggests that moisture or heat has caused the material to expand and potentially lose its integrity. Water damage can lead to a breakdown of the material, increasing the risk of exposure to asbestos fibers. Flaking typically signifies that the coating or surface layer is deteriorating, which could allow harmful fibers to become airborne. Therefore, while all of these can signal problems with friable ACM, color changes should not be seen as a definitive sign of physical injury.