Quality control of white soft paraffin

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Abstract
Samples of white soft paraffin complying with pharmacopoeial requirements vary in their physical properties. Some samples produce hard waxy lumps and permit excessive separation of liquid components (bleeding). Measurement of melting and congealing points and consistency by penetrometer failed to reveal these differences. The viscosity of samples after 20 min shear (1159s−1) is related to lump formation as detected by usual examination of samples heated and cooled without stirring and spread on a tile after gentle mixing.

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