This standard belongs to the general test method system for pigments and extender pigments, specifying the relevant requirements for determining sieve residue using the mechanical flushing method. The principle involves using rotating water flow to induce centrifugal motion of the dispersed sample in water, allowing fine particles to be flushed through the sieve while coarse particles are retained, dried, and weighed to calculate the proportion of sieve residue. The standard is applicable to powders or particles that can be dispersed in water but not to samples that are difficult to wet with water or formed into spherical granules. The testing process requires instruments such as a mechanical flushing device, test sieves of specific specifications, an oven, a balance with an accuracy of 0.1 mg, and a desiccator. It also details technical aspects such as container material and dimensions, water flow rate, and dispersion preparation, providing a standardized basis for the quality testing of related products.