Which of the following is NOT considered a friable material?

Friable materials are those that can be easily crumbled, and when disturbed, can release asbestos fibers into the air. Each of the options represents different materials commonly found in buildings that may have been used in construction prior to the widespread awareness of the dangers of asbestos.

Textured ceilings can often be made from materials containing asbestos, and when they are disturbed, they can fall apart easily, thus becoming a source of asbestos fibers. Pipe insulation is known for being made from materials that can be friable; when these materials age or become damaged, they can break apart and release fibers. Wrapped insulation, frequently used on steam pipes and other heat sources, may also be friable, especially if the wrapping is damaged or deteriorated.

In contrast, miscellaneous products encompass a wide variety of materials and may include those that are not friable or do not contain asbestos at all. Therefore, selecting miscellaneous products as the answer indicates an understanding that this category is not consistently associated with friability in the same way as the other specified types of materials. This reasoning clarifies why miscellaneous products are not classified as friable.