What insulating material is now banned due to its carcinogenic properties?

Asbestos is the insulating material that has been banned due to its carcinogenic properties. This substance, once widely used in construction and insulation, is now known to pose serious health risks, including lung cancer and mesothelioma when its fibers are inhaled. Over time, extensive research and public health concerns have led to regulations and outright bans on its use in many countries, including the United States.

In contrast, the other materials listed—fiberglass, mineral wool, and cellulose—do not have the same level of associated health risks. Fiberglass, for example, is commonly used for insulation and is generally considered safe, though it can irritate the skin and lungs if proper precautions are not taken during installation. Mineral wool also has good fire-resistant properties and does not carry the same carcinogenic risk as asbestos. Cellulose insulation, made from recycled paper, is often treated with fire retardants and is considered a safer alternative to asbestos. Thus, while all the materials listed may be used for insulation, only asbestos is recognized for its harmful and carcinogenic nature, leading to its ban and stringent regulations surrounding its removal and disposal.