The many uses of the mineral fiber asbestos
Since then, asbestos litigation has become the longest running mass tort in U. If you are considering DIY asbestos abatement, remember the following precautions: Seal off the work area with plastic sheets and turn off the air conditioning. In one case, development extended for 5 km along the strike and was being developed or diamond drilled to more than m in depth. Its use has been banned in most countries for approximately the last 30 years. In the late s, court documents proved that asbestos industry officials knew of asbestos dangers since the s and had concealed them from the public. In some cases, high pressures tend to develop from an arching effect. Introduction The term asbestos is derived from a Greek word meaning "inextinguishable, unquenchable or inconsumable. Alternatives to Asbestos Since the s, manufacturers in the United States have largely phased out the use of asbestos, relying instead on several safer substitutes: Polyurethane foam is cheap and effective for insulation. Why Is Asbestos Hazardous?
Learn how and when to remove this template message People have used asbestos for thousands of years to create flexible objects, such as napkins, that resist fire.
The asbestos industry has powerful lobbying organizations protecting its interests. Wagner — went on denying any responsibility.
The third wave is associated with exposure to asbestos in situ; e. It has truly been called a physical paradox being both fibrous and crystalline, elastic and brittle, yet able to be carded and so converted as to be spun and woven like wool, flax or silk. Because this group of silicate minerals can be readily separated into thin, strong fibers that are flexible, heat resistant, and chemically inert, asbestos minerals were once used in a wide variety of products.
Companies used the mineral in products like cement, adhesives and brakes because it is heat- and fire-resistant, as well as helps the materials withstand chemical reactions.
Asbestos is made up of microscopic fibers that can easily become airborne and inhaled. Of the amphibole subclass, brown asbestos can be found in many talc mines and has been associated with some respiratory disorders.
In the United States, asbestos is not banned, but it is highly regulated.
Surface mining offers advantages in recovery, grade control, economy, and safety. Like all forms of cancer, these mutated cells spread and wreak havoc on the body, until they prevent an organ from performing tasks necessary for survival.
Where does asbestos come from
Many countries have discontinued these uses since the health risks of asbestos became apparent. Now open-pit mining prevails. Because of their shape, the asbestos particles cling to tissues of the lungs and other areas of the respiratory system. According to a recent report, about two million tons of asbestos are produced across the globe each year. These materials are dangerous because they can easily release toxic dust into the air. Use of asbestos did not increase significantly until after when large chrysotile deposits in Canada and Russia, and amosite and crocidolite deposits in South Africa, were discovered. At the end of , the EPA is expected to finish its latest risk assessment of asbestos and determine whether to fully ban asbestos products in the United States. Use of asbestos cement products such as corrugated sheet and cavity roof decking, drainage and sewage pipes are acceptable under current regulations. The vermiculite insulation mined in Libby was marketed to the public as Zonolite insulation and may still be in use in homes and public spaces throughout the U. Later, when pits reached considerable depth, overhead cableway derricks were used.
Related topics:. Asbestos companies made enormous profits by selling insulation to shipbuilders during World War II, and they expanded their business further during the postwar building boom.
based on 98 review