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Abstract

The component of clarity of polymer films, dependent on optical resolution, was conveniently and objectively determined from light-scattering measurements at low angles (i.e., below 1°). The width of the scattering curve at half the maximum intensity was used as an index of clarity. This quantity is essentially equivalent to the minimum angle of resolution obtained when viewing a test object through the film. By applying a correction for the resolution of the instrument, the range of the instrument was extended in the direction of high clarity, and within the precision of the measurements the clarity ratings are independent of instrument characteristics.