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Pigments and extenders - Methods of assessment of dispersion characteristics - Part 2: Assessment from the change in fineness of grind
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 its fineness of grind is determined as described in ISO 1524.
The fineness-of-grind values are plotted graphically as a function of the dispersion work done (expressed as time, number of revolutions, etc.). From the graph, the work necessary to obtain an agreed fineness of grind is determined.
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