This standard primarily specifies the principles, instruments, and test procedures for determining the particle size distribution of powder coatings using the sieving method. The core of the method involves using a set of standard test sieves with different apertures to sieve the sample either mechanically or manually. The mass of powder retained on each sieve layer is then weighed separately to calculate the particle size distribution of the powder. This method is suitable for measuring powder coatings with particle sizes mainly ranging from 32 micrometers to 300 micrometers, and it is commonly used for quality control and to check for the presence of oversized particles or contaminants. In addition to sieving, instruments such as laser particle size analyzers (e.g., dry laser particle size analyzers) are also used in the industry for more efficient and precise particle size analysis.