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By National Research Council, Division on Earth and Life Studies, Commission on Life Sciences, Board on Toxicology and Environmental Health Hazards, Committee on Nonoccupational Health Risks of Asbestiform Fibers

Greater than 30 million hundreds asbestos utilized in the USA considering that 1900 is current as insulation in workplaces and faculties, as vinyl-asbestos floor in houses, and in different universal items. This quantity provides an overview of the relation of those fibers to express illnesses and the level of non-occupational dangers linked to them.

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That is, the strength of the fibers per unit of cross-section area increases as the diameter decreases. Thus, the smaller the diameter of the fiber, the greater its strength. The diameter-dependent variation in the strength of fine wires was first observed by van Müsschenbroeck (1729). , Karmarsch, 1824; Gerstner, 1831), including famous bridge builders in the early 19th century (Dufour, 1823; Seguin, 1824; Telford, 1814). An apparent strength-diameter effect was also observed in glass fibers by Threlfall (1890) and confirmed and quantitatively analyzed by Griffith (1921).

Table 2-1 lists the names and chemical formulas of the minerals included in the term asbestos. Other minerals used in industry, such as TABLE 2-1. Mineralogy of Commercial Asbestos Mineral Name Commercial Name Chrysotile Chrysotile Crocidolite Riebeckite Anthophyllite Anthophyllite Amosite Cummingtonitegruneritea Actinolitetremoliteb a Mineral Group Serpentine Amphibole Amphibole Amphibole Amphibole Chemical Formula (Mg, Fe)6(OH)8Si4O10 Na2(Fe3+2(Fe2+)3(OH)2Si822 (Mg, Fe)7(OH)2Si8O22 Mg7(OH)2Si8O22 Fe7(OH)2Si8O22 Ca2Fe5(OH)2Si8O22 Ca2Mg5(OH)2Si8O22 Hyphenated mineral names, such as cummingtonite-grunerite, represent MINERAL SERIES.

Most of these and other early applications of asbestos were relatively isolated examples. Asbestos was not available in large enough amounts for widespread use until the extensive Canadian deposits were discovered lace in the 19th century. Subsequently, asbestos came into wide use for insulation, reinforcement of tiles and cements, and as an absorbent, thickener, and filler. MINERALOGICAL TERMINOLOGY Before discussing the properties associated with asbestiform fibers, a few definitions are provided.

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Asbestiform fibers : nonoccupational health risks by National Research Council, Division on Earth and Life Studies, Commission on Life Sciences, Board on Toxicology and Environmental Health Hazards, Committee on Nonoccupational Health Risks of Asbestiform Fibers


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