In ceramics, this refers to the particle size of a powder. A 200 screen has 200 wires-per-inch. The openings between the wires measure 74 microns (the width of a typical human hair).
100 micron is finer then the 600 micron. They measure the holes in the mesh in microns, so the higher the number the larger the holes.
What does 200 mesh size mean?
In ceramics, this refers to the particle size of a powder. A 200 screen has 200 wires-per-inch. The openings between the wires measure 74 microns (the width of a typical human hair).