Comparison table of mesh size and opening of standard sieves in various countries

Mesh number and mesh size comparison table of standard sieves in various countries
Standard sieve is also called test sieve, inspection sieve and sample sieve.
Standard sieve mesh number:
1. Mesh refers to the number of empty holes on the sieve per square inch. 50 mesh means 50 holes per square inch, and 500 mesh means 500 holes. The higher the mesh number, the more holes. In addition to indicating the holes of the sieve, it is also used to indicate the particle size of particles that can pass through the sieve. The higher the mesh number, the smaller the particle size. The standard sieve needs to be used with a standard vibrating sieve machine to accurately measure 
2. The size of powder particles is called particle size. Due to the complex shape of particles, there are usually several ways to express it, such as screening particle size, sedimentation particle size, equivalent volume particle size, and equivalent surface area particle size. Screening particle size is the size of the sieve holes that particles can pass through the sieve, expressed as the number of sieve holes in a sieve with a width of 1 inch (25.4mm), so it is called "mesh number".
At present, there is no unified technical standard for powder particle size at home and abroad, and each company has its own definition and expression method of particle size indicators. The sieve specifications in different countries and industries have different standards, so the meaning of "mesh" is difficult to unify. At present, the international comparison uses the calculated diameter of equivalent volume particles to express the particle size. It is expressed in μm or mm.   

Standard mesh number | particle size comparison table: