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Chemical properties of asbestos: this article describes the chemical properties of asbestos in various forms, such as asbestos solubility, the affect of acids on asbestos, the effects of heat on asbestos, and related properties.
This article series describes the physical properties of asbestos including its mechanical, chemical, electrical and related properties both in pure asbestos form and when asbestos is mixed with other materials like cement or rubber. As the author points out, while this is a lenghty article, there is far more detailed information about asbestos properties, chemistry, etc. A separate ASBESTOS BIBLIOGRAPHY gives access to much of that data.
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One of the more important theories concerning formation of asbestos recognizes that the primary rock formation out of'which asbestos mother rock emerged is of volcanic origin. In Canada and other important asbestos areas, this green colored mother rock is principally olivine, classified chemically as magnesium silicate.
The pH of asbestos is generally listed as 9 to 10. When asbestos is acid washed or subjected to other chemicals, it can be made to behave tisfctôrily with acid curing poly mers or resin systems
The chemical feature common to all asbestos is that they are hydrated silicates The degree of hydration varies from approximately one per cent in some types to as much as approximately 14 per cent in most kinds of chiysotile It generally accepted that asbestos is a metamorphic product derived from certain types of silica-bearing minerals.
Effects of Chemicals on Asbestos
Published data showing the effect of chemicals on asbestos are given inTable 2.9 below. it is reported that room temperature tests were conducted for periods of 24, 192, 360, and 528 hr. * ASTM (D577-52, Method D39, Section 10) tensile grab test.
Inasmuch as most of the fibers reached maximum solubility after 528 hr, only this period was reported.
TABLE 2.9. SOLUBILITY OF ASBESTOS
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