GB/T 6609.27 - 2009 specifies the method of particle size analysis of aluminum oxide by screening method. It specifies the collection and preparation of the sample to ensure that the sample can represent the whole. Detail the requirements of screening equipment, such as sieve specifications, screening instrument performance, etc., standardize the operation process, covering key parameters such as screening time and vibration Frequency. By following this standard, the particle size distribution of aluminum oxide can be accurately determined. This is of great significance for the application of aluminum oxide in refractory materials, ceramics and other industries. It can help enterprises choose products reasonably according to the characteristics of particle size, optimize the process, and improve product mass and production efficiency.