ISO 8781-3 discusses pigments and extenders. The aim of the ISO 8781 series is to provide best industry practices for assessing dispersion characteristics that help in determining the characteristics of paints.
ISO 8781-3 is the first part of the ISO 8781 series of standards that specifies a method for assessing, on the basis of specular gloss, the dispersion characteristics of pigments that have been dispersed by one of the methods of dispersion described in ISO 8780. It should be read in conjunction with ISO 8780-1.
The method is of general use for comparing similar pigments, for example a test pigment against an agreed reference pigment.
ISO 8781-3 on pigments and extenders is useful for
An extender pigment is a naturally occurring chemical substance (usually having a white colour) that is added to paint or coating to improve its properties. The dispersion process is important if the process is not done right the paint will not hold up and the colour and appearance qualities will be poor.
ISO 8781-3 provides you with a test to assess dispersion characteristics based on the change in gloss. ISO 8781-3 also guides you with sampling, test procedures, and test reports.
If you are a manufacturer, ISO 8781-3 can help you to improve the quality of your paints and their properties such as durability, cost, and resistance to corrosion or wear.