The mesh size，it is the number of holes, which refers to the number of holes per square inch. The larger the mesh, the smaller the particle size. Generally, the mesh size * aperture = 15000, that is, the mesh size of 400 is about 38 microns。500 mesh，the purpose is about 30 microns. Because the silk used in the preparation of the net is different, the standards are different in different countries. There are currently American standards, British standards and Japanese stand.
For details, please refer to the following comparison table.