The standard is ISO 1524-2000 "Determination of the fineness of grind of Paints, varnishes and Printing inks". The standard specifies the method for determining the fineness of grind of Paints, varnishes and Printing inks by tools such as Grindometer, covering instrument construction, sample preparation, operation steps and result reading. The fineness of grind reflects the dispersion degree of solid particles such as pigments in the medium. This method provides a technical basis for evaluating the production process level, film performance and printability of Coatings and inks by quantifying the particle size distribution. It is suitable for quality control and R & D testing of related products.