By Irving J. Selikoff (Auth.)
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Extra resources for Asbestos and Disease
Lindell has 2 recently given somewhat different figures (461): 450,000 lb/in. for 2 2 chrysotile, 500,000 lb/in. for glass fiber, 155,000 lb/in. for carbon steel, 2 2 73,000-89,000 lb/in. for cotton fiber, and 60,000 lb/in. for rock wool 2 2 (lb/in. 073 kg/cm ) (see also 809). When chrysotile is heated to 300°C or above, the tensile strength is diminished; after 3 min at 650°C the strength may be reduced to one-third. Crocidolite may be durable up to 800°C (628). The tensile strength of tremolite and anthophyllite is generally weak.
Further studies and comments on asbestos disease, together with a description of the "curious bodies," later to be called "asbestos bodies," were given in another paper in 1929 (158). The word "asbestosis" appeared for the first time in the title of the second 1927 paper (157). Acceptance was not immediate, however. Pancoast and Pendergrass, reviewing radiological appearances of the pneumoconioses, believed that the fibrosis of asbestos workers was due to admixed silica (567). Badham, however, writing in 1927, considered that "silicatosis" was more damaging than "silicosis," but he was dealing with hard rock miners, not asbestos workers (61).
GEOLOGICAL FORMATION Although the amphiboles are major participants in rock formation, asbestiform amphiboles rarely occur in concentrated deposits that can be economically developed. Chrysotile, on the other hand, is not a common rock-forming mineral, but it does occur in a number of large scale deposits. Details of the origin of the asbestos deposits have not been completely resolved. The present account, intended as background to discussions of asbestos use and its biomedical effects, has been drawn from a number of reviews which should be consulted for further information and specific references (108,328,628,686,708).
Asbestos and Disease by Irving J. Selikoff (Auth.)