Manufacture of Asbestos Magnesia Pipe Insulation 1930 ...

Magnesia pipe insulation is made from magnesia alba or magnesium carbonate which is an inroganic, inert product that was for many years used in medicine (milk of magnesia) and in other various manufacturing. In 1885 Hiram M Hanmore, a pipe coverer, began to mix magnesia with other pipe covering materials. In about the same time manufacturers of magnesia for medical purposes also began to discover the insulation capacity of the fine, white magnesia powder. Experiments soon were under way mixing magnesia with many materials in an effort to find the best insulator. Asbestos fibers was one of those materials and it acted as a binder to give strength and cohesion to the magnesia sludge which then could be cast or molded into standard shapes and dried. The optimum mix became 85 percent magnesia and 15 percent asbestos fibers. The principle type of asbestos fiber was chrysotile though amosite and crocidolite were also used. 85 percent magnesia pipe removed today after nearly a half a century or more is in just as perfect condition as when it was originally installed. Johns-Manville Corporation was founded in 1858 as the HW Johns Manufacturing Company of New York, NY and was based on the principle uses of asbestos as fire resistant roofing material. In 1886 the inception of the Manville Covering Company of Milwaukee, Wisconsin was founded on the principle uses of asbestos as a heat insulating material. In 1901 HW Johns Manufacturing Company and Manville Pipe Covering Company ?
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Until the 1980s in the US, asbestos was a popular material in industrial, commercial and construction applications. Asbestos typically found its way into homes and workplaces during construction or renovation, when asbestos-containing products such as floor tiles or roofing felt were installed. These products remained popular for many decades because they were cheap, made from easily-acquired materials and minerals, and had beneficial fire-retardant properties. To demonstrate the heat resistant properties of its roofing materials, Johns-Manville promoted this blow torch test. Johns-Manville Corporation was founded in 1858 as the HW Johns Manufacturing Company of New York, NY and was based on the principle uses of asbestos as fire resistant roofing material. In 1886 the inception of the Manville Covering Company of Milwaukee, Wisconsin was founded on the principle uses of asbestos as a heat insulating material. In 1901 HW Johns Manufacturing Company and Manville Pipe Covering Company merged to form HW Johns-Manville Company of New York, NY The company was reincorporated as Johns-Manville Corporation in 1926. Between 1900 and the mid 1980s, asbestos was used in over 3000 different products. During the 20th century, more than 30 million tons of asbestos were used in industrial facilities, homes, schools, shipyards, steel mills, power plants and commercial buildings in the United States. Asbestos is term used to describe six naturally occurring minerals with similar ?
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Tags: asbestos, asbestos fiber, asbestos fibers, century, johns manville corporation, magnesium carbonate, manufacturing, percent, Pipe, pipe insulation

Source: http://mesothelioma.eggamuffin.com/2011/08/manufacture-of-asbestos-magnesia-pipe-insulation-1930/?utm_source=rss&utm_medium=rss&utm_campaign=manufacture-of-asbestos-magnesia-pipe-insulation-1930

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