What must an asbestos handler do if they become aware of unknown materials?

An asbestos handler must treat all unknown materials as if they may contain asbestos until tested because of the serious health risks associated with asbestos exposure. Asbestos is known to cause severe respiratory diseases, including lung cancer and mesothelioma, and its fibers can be harmful when disturbed. Given that dangerous materials may not always be visibly identifiable, assuming that unknown materials could contain asbestos ensures that proper precautions are taken.

This approach often involves taking measures such as wearing appropriate personal protective equipment (PPE), securing the area, and conducting necessary testing before further handling. Being cautious and treating potential hazards seriously is crucial in environments where asbestos may have been used historically in construction and insulation materials.