GB/T 43211-2023 specifies the mechanical screening method for the determination of cork particle size. It specifies the required screening equipment, such as different specifications of sieve, vibration sieve machine parameters. Detail the preparation of cork pellet samples, including sampling volume, sample pretreatment, etc. Standardize the screening operation process, from the control of screening time, the vibration Frequency of the screening process, to the calculation of the final particle size result. Through this standard, the particle size distribution of cork can be accurately determined, providing a scientific basis for cork production enterprises to control the mass of products and downstream industries to select suitable cork pellets according to the particle size requirements, and promoting the standardized development of the cork industry.