This part of EN ISO 8780 specifies a method for the dispersion of pigments and extenders using a triple-roll mill. The result permit conclusions to be drawn as to the behaviour of the products tested when dispersed using corresponding machinery. This part of EN ISO 8780 is for use in conjunction with the methods of assessment described in EN ISO 8781, using an agreed binder system of high viscosity free from volatile materials. It should be read in conjunction with EN ISO 8780-1.