Average fiber size is somewhat thicker. Scanty results from studies in occupational cohorts and animals suggest that mineral wool is no more potent than asbestos, and probably less. See remarks for lung cancer on previous page. Most of the assessment is based on current production and very limited uses. 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.
Assessment is based almost entirely on consideration of the currently low exposure levels.