According to the application industry, the unit is usually "mesh" or "millimeter" or "micrometer", while the factory usually takes "mesh" as the specification unit for factory production and acceptance. It is also a unit of particle size. How to convert the "mesh" of quartz sand into "millimeter" and "micrometer"?

1. Mesh refers to the number of empty holes on the screen per square inch. 50 mesh refers to 50 holes per square inch, and 500 mesh refers to 500 holes. The higher the mesh number, the more holes. In addition to representing the mesh of the screen, it is also used to represent the particle size of particles that can pass the screen. The higher the mesh number, the smaller the particle size. The standard screen needs to cooperate with the standard vibrating screen machine to accurately determine.

2. The particle size of powder is called particle size. Due to the complex shape of particles, there are usually several expression methods such as screening particle size, sedimentation particle size, equivalent volume particle size and equivalent surface area particle size. Sieve size is the size of the mesh through which particles can pass through the screen, which is expressed by the number of mesh in the 1-inch (25.4mm) wide screen, so it is called "mesh size".

At present, there is no uniform technical standard for particle size at home and abroad, and each enterprise has its own definition and representation of particle size index. There are different standards for screen specifications in different countries and industries, so it is difficult to unify the meaning of "mesh". At present, the calculated diameter of equivalent volume particles is used to express the particle diameter internationally. with μ M or mm.