This part of ISO 8780 specifies a method for the dispersion of pigments and extenders using a bead mill. It is for use in conjunction with the methods of assessment described in ISO 8781, using an agreed binder system of low viscosity. It should be read in conjunction with ISO 8780-1. This method is restricted to low- and medium-viscosity mill bases allowing free movement of the grinding spheres (see clause 7). Therefore, it is suitable for mill bases having a viscosity higher than those for which the dispersion method described in ISO 8780-2 is appropriate