Abstract
A novel and useful device is described to measure the coefficient of sliding friction and the scuff load of ophthalmic solutions for polymeric surfaces. Instead of the conventional electric continuity method, a strain gauge bridge is employed to measure the stability. Vertical forces in the range of 1–10 g are applied to a spherical stylus which runs in a track of lubricating solution applied to a rotating plate of the same or different material as the stylus. The plate rotates at constant speed with respect to the stylus. The horizontal force resulting from friction has been of the order of 0.01–0.10 g. The device is capable of resolving small differences in the lubricating quality of ophthalmic solutions having a low coefficient of friction. The usefulness of the device has been demonstrated by measuring the lower coefficients of friction of an ophthalmic solution in the above-mentioned range of small vertical forces. Reproducible data have been obtained for the ophthalmic test solution.
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