A blank means that even comparative risk assessment was untenable given the data available. Between 10 and 100 times the corresponding value or between 0.01 and 0.1 times that value, respectively, and so on. The committee also attempted to provide a sense of the quality of these judgments. Most is probably excreted rapidly, but the amount that moves into the body is not known. Fibers are respirable in size but are often well contained, and only a few major sources are likely to provide Significant exposures.
Little information is available on biological effects.
See remarks on previous page. In-Vitro Studies . In-Vitro Studies See remarks for lung cancer on previous page.