This standard is the general part of the GB/T 21868 series of standards, which outlines the different dispersion methods for assessing the dispersion of pigments and extenders. This series of standards applies to the dispersion of pigments into specific paint-based systems to evaluate their dispersion performance. The methods specified in the standard can be used to compare the dispersion of similar pigments, such as the comparison of test pigments with reference pigments, and the test results can provide reference for the production process. This part includes normative reference documents and general rules, which provide basic guidance for subsequent specific dispersion methods (such as oscillatory grinding, high-speed Stirrer, sand grinding, etc.). It is suitable for quality control and technical research in the pigment industry.