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Pigments and extenders - Methods of assessment of dispersion characteristics - Part 3: Assessment from the change in gloss
The method is of general use for comparing similar pigments, for example a test pigment against an agreed reference pigment.
The pigment is dispersed in stages under specified conditions in an agreed binder system. After each stage, a portion of the mill base is taken and made into a composition that is applied to a substrate and dried or stoved.
The specular gloss of each dried film is determined as described in ISO 2813. The gloss values are plotted graphically as a function of the dispersion stage (expressed for example as time, number of revolutions of a muller).
From the graph, the dispersion work necessary to obtain an agreed specular reflection value is determined.
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