Asbestos is a mineral fiber that is mined out of rock. Due to its heat-resistant qualities, asbestos was used extensively in industry and onboard ships for thermal insulation. Asbestos was also used as a binder in numerous drywall and cement products. Asbestos is not dangerous in its inert form. However, when it is cut or disturbed, asbestos releases millions of microscopic fibers into the atmosphere. These fibers, when inhaled deep into the lung, can cause irreversible injury to humans.