ASTM D185-07 (2023) Standard Test Method for Coarse Particles in Pigments specifies a standard test method for determining the content of coarse particles in pigments. This standard is primarily used to evaluate the presence of large particles in pigments that may affect the dispersion of pigments, the uniformity of coatings, and the appearance mass of the final product. The test method uses screening techniques to determine the Particle size distribution of particles in pigment samples, especially particles larger than the specified sieve pore size. This standard is applicable to the quality control of various pigment products and helps to ensure the fineness and uniformity of the product, ensuring that its performance in applications such as coatings, paints, etc. meets requirements.