Asbestos (a misapplication of Latin: asbestos "quicklime" from
Greek ἄóâåóôïò: a, "not" and sbestos, "extinguishable") describes any of a group of fibrous metamorphic minerals of the hydrous magnesium silicate variety. The
name is derived for its historical
use in
lamp wicks; the resistance of asbestos to fire has
long been exploited for a variety of purposes. Asbestos was used in fabrics such as Egyptian burial cloths and Charlemagne's tablecloth which according to legend, he threw in a fire to
clean. Asbestos occurs naturally in many forms (see below); it is mined from metamorphic rocks.
When asbestos is used for its resistance to fire or
heat, the fibers are often mixed with cement or woven into fabric or mats. Asbestos is used in brake
shoes and gaskets for its
heat resistance, and in the past was used on electric oven and hotplate wiring for its electrical insulation at elevated temperature, and in buildings for its flame-retardant and insulating properties, tensile
strength, flexibility, and resistance to chemicals. The inhalation of some kinds of asbestos fibers, however, causes various serious illnesses, including cancer. Thus, most uses of asbestos are banned in many countries. Fiberglass or Synthetic Mineral Fibre has been found to be a suitable substitute for thermal insulation, and woven ceramic fiber performs as
well as or better than asbestos as an insulator of high-temperature electrical conductors
