The higher mesh number means the smaller particle size; the fewer mesh number means the larger particle size. Sieve size is the mesh aperture where particles can get through the screen. Use the screen number within 1-inch (25.4mm) screen to denote, so it is called as mesh number.

    The specification of standard sieve in various countries is not the same. Frequently-used Taylor system takes apertures per inch as screen size, called mesh. For example, the sieve of 100 mesh means there are 100 screen holes on the screen per inch.

    Tyler standard screen scale

    The scale division of Tyler screen scale takes 200 mesh apertures, 0.074mm as the benchmark. Multiply or divide by n (n=1, 2, 3…) powder of the square root (1.414) of main mod 2, then we get mesh aperture, thicker or finer than 200 mesh. If we multiply or divide n powder of the fourth root of vice mod 2 by 0.074mm, we can get mesh apertures of a series of mesh numbers with much more specific scale division.

    Mesh aperture and standard mesh number  

Mesh aperture：4.75mm standard mesh number：4mesh

Mesh aperture：4.00mm standard mesh number：5mesh

Mesh aperture：3.35mm standard mesh number：6mesh

Mesh aperture：2.80mm standard mesh number：7mesh

Mesh aperture：2.36mm standard mesh number：8mesh

Mesh aperture：2.00mm standard mesh number：10mesh

Mesh aperture：1.70mm standard mesh number：12mesh

Mesh aperture：1.40mm standard mesh number：14mesh

Mesh aperture：1.18mm standard mesh number：16mesh

Mesh aperture：1.00mm standard mesh number：18mesh

Mesh aperture：0.850mm standard mesh number：20mesh

Mesh aperture：0.710mm standard mesh number：25mesh

Mesh aperture：0.600mmstandard mesh number：30mesh

Mesh aperture：0.500mm standard mesh number：35mesh

Mesh aperture：0.425mm standard mesh number：40mesh

Mesh aperture：0.355mmstandard mesh number：45mesh

Mesh aperture：0.300mm standard mesh number：50mesh

Mesh aperture：0.250mm standard mesh number：60mesh

Mesh aperture：0.212mmstandard mesh number：70mesh

Mesh aperture：0.180mm standard mesh number：80mesh

Mesh aperture：0.150mm standard mesh number：100mesh

Mesh aperture：0.125mmstandard mesh number：120mesh

Mesh aperture：0.106mm standard mesh number：140mesh

Mesh aperture：0.090mm standard mesh number：170mesh

Mesh aperture：0.0750mmstandard mesh number：200mesh

Mesh aperture：0.0630mm standard mesh number：230mesh

Mesh aperture：0.0530mm standard mesh number：270mesh

Mesh aperture：0.0450mmstandard mesh number：325mesh

Mesh aperture：0.0374mm standard mesh number：400mesh

 
    A plus or minus sign before mesh number denotes whether it can get through the screen hole of this mesh number. Minus means particles can get through the screen hole of this mesh number. That is to say the particle size is less than mesh size. Positive number denotes particles cannot get through the screen hole of this mesh number. That is to say the particle size is bigger than mesh size. For example, particles of -100mesh~+200mesh denote these particles can get through the screen hole of 100 mesh while cannot get through the screen hole of 200 mesh. When we filter particles of this mesh number, we should put particles of larger mesh number (200) under smaller mesh number (100). Then the remaining on the screen of larger mesh number is the particles of -100~+200 mesh.
     Please visit our chinese web page to look up The Comparison Table of Aperture And Mesh Number in Various Countries.