Codes & Standards - Purchase
ISO 8781-3:1990
Pigments and extenders -- Methods of assessment of dispersion characteristics -- Part 3: Assessment from the change in gloss
SKU: iso_016203_107240
Published by ISO
Publication Year 1990
1 Edition
4 pages
Product Details
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.