Man-made mineral fiber size fractions and their interrelation.

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Abstract
The fiber fractions RFOM (respirable fibers, determined by optical microscopy), SF (Stanton fibers), PF (Pott fibers) and FLOM (total length of optically visible, respirable fibers) and their ratios were determined experimentally in fiber sizes obtained by scanning electron microscopy of air samples of man-made mineral fibers and calculated theoretically for a range of fiber size distributions, assumed to be bivariate log-normal. For realistic values of fiber size parameters, RFOM and even FLOM are good predictors of SF and PF, the better the more-detailed the size information available is. Past exposure to SF or PF fractions of airborne man-made fibers may be estimated even though only RFOM were determined.

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