The number of meshes indicates the thickness of the whetstone. The more meshes, the finer. Sandpaper is also marked in the same way. So 800 is better than 500. The mesh number is defined in physics as the particle size or thickness of the material, and the general definition refers to the number of holes in the screen within 1 square inch. The larger the mesh number, the finer the particle size of the material; the smaller the mesh number, the larger the material particle size. The sieving particle size is the size of the sieve holes through which the particles can pass through the sieve. The specifications of standard sieves vary from country to country. The commonly used Taylor system uses the number of holes per inch as the sieve number, which is called mesh.
For example, a 100 mesh sieve means that there are 100 sieve holes per inch of the sieve. A negative number means that the mesh can pass through the mesh, that is, the particle size is smaller than the mesh size; while a positive number means that the mesh cannot pass the mesh, that is, the particle size is larger than the mesh size. For example, the particle size is -100 mesh to +200 mesh, which means that these particles can leak through the 100 mesh mesh but cannot leak through the 200 mesh mesh. When screening particles of this mesh size, the mesh number should be large ( 200) is placed under the small mesh (100) screen, and the particles left in the large mesh (200) screen are -100~+200 mesh particles. The mesh of the whetstone refers to the diameter of the abrasive particles of the whetstone material. The diameter of the whetstone is 3000 mesh. The diameter of the abrasive material is about 2 micrometers, and the diameter of the 12500 mesh. The diameter of the abrasive particles is about 1 micrometer. Generally, the whetstone reaches 8000 When looking at it, the polished knives present a "mirror surface" effect, and the blade surface can be used as a mirror. The mesh number of the whetstone is not static. When the slurry is grinded, the grinding particles of the whetstone will also be broken. As the grinding continues, the "mesh number" will increase, especially for natural grindstones. This feature.
