This standard describes a method for determining the mass fraction of sieve residue (i.e., coarse particles and coagulum) in coagulated polymer dispersions. The core procedure involves diluting the sample with deionized water, followed by filtration, washing, drying, and weighing using a metal wire mesh test sieve of a specified aperture size to quantify the undesirable solid particles. The standard specifies clear requirements for key testing instruments, stipulating that the test sieve must comply with the technical specifications of GB/T 6003.1. Additionally, to enhance the consistency and accuracy of the test, the method may involve the use of a stirrer to ensure homogeneous dispersion of the sample, and specific requirements are set for temperature control precision in the testing environment. This method is a modified adoption of the corresponding international standard.