The conversion between mesh and millimeter

Customers who come into contact with powder will encounter the problem of conversion between mesh and millimeter, such as 800 mesh equals how many millimeters, 1 millimeter equals how many mesh, why are there different conversion results? The mesh is an attribute to be used by the grinding equipment to indicate the fineness of the powder, and how should we understand the mesh? How does it correspond to the relationship between mesh and millimeter and micron?

What is mesh?

Mesh is the number of holes that pass through 1 inch of sunscreen. In other words, the more holes, the finer the sieve, that is, the finer the powder obtained. The calculation of mesh size varies slightly from project to project, but it all indicates the fineness of the powder.

Measurement unit mesh size is the size of the raw material particles, generally expressed by the greater length of the particles. Mesh is the size of the sieve hole size of the standard sieve. In the Taylor standard sieve, the so-called mesh is the number of holes in the length of 2.54 cm (1 inch), and referred to as mesh.

Taylor standard sieve system: Taylor sieve system is divided by 200 mesh sieve hole size 0.074mm, multiply or divide by the nth power of the square root of the main modulus (1.141) (n = 1, 2, 3 ......), you get a coarser or finer than 200 sieve hole size, if the number 2 of the four square root (1.1892) of the nth power to multiply or divide by 0.074 mm, a series of sieve sizes with finer gradations can be obtained.

The larger the number of mesh, the finer the particle. It is similar to the magnification of metallographic tissue.

Boost: A plus or minus sign in front of the mesh size indicates whether the mesh size can be missed. A negative number means that the mesh can be missed, i.e., the particle size is smaller than the mesh size; while a positive number means that the mesh cannot be missed, i.e., the particle size is larger than the mesh size. For example, the particles are -100 mesh to +200 mesh, that is, these particles can be missed from the mesh of 100 mesh and not from the mesh of 200 mesh, in screening the particles of this mesh, should be placed under the mesh of large (200) mesh small (100) mesh, in the mesh of large (200) mesh left that is -100 ~ 200 mesh particles.

From the table below, we know that 1 mm is about 14 mesh, while 80 mesh is 0.177 mm and 800 mesh is 18 microns, i.e., 0.5 mm.

Common conversions between millimeters microns mesh

（mm）                                 （μm）                              mushu

1mm                                      1000μm                                    14

0.0841mm                                  841μm                                    20

0.0707mm                                  707μm                                    25

0.595mm                                   595μm                                    30

0.5mm                                     500μm                                    35

0.42mm                                    420μm                                    40

0.354mm                                   354μm                                    45

0.297mm                                   297μm                                    50

0.25mm                                    250μm                                    60

0.21mm                                    210μm                                    70

0.177mm                                   177μm                                    80

0.147mm                                   147μm                                    100

0.125mm                                   125μm                                    120

0.105mm                                   105μm                                    140

0.075mm                                    75μm                                    200

0.068mm                                    68μm                                    230

0.065mm                                    65μm                                    270

0.044mm                                    44μm                                    325

0.037mm                                    37μm                                     400

0.02mm                                     20μm                                     500

80 mesh-325 mesh is the fineness achieved by ordinary Raymond mill, and is the mesh conversion we are more often involved in.

When there is no data available, you can get it by the following:

Empirical formula: 15000 = mesh (mesh) * micron (μm)

Sieve inner diameter (μm) ≈ 14832.4 / sieve mesh

A more comprehensive mesh conversion:

mushu    μm    mushu         μm 

2          8000      100        150

3          6700      115        125

4          4750      120        120

5          4000      125        115

6          3350      130        113

7          2800      140        109

8          2360      150        106

10         1700      160         96

12         1400      170         90

14         1180      175         86

16         1000      180         80

18          880      200         75

20          830      230         62

24          700      240         61

28          600      250         58

30          550      270         53

32          500      300         48

35          425      325         45

40          380      400         38

42          355      500         25

45          325      600         23

48          300      800         18

50          270      1000        13

60          250      1340        10

65          230      2000        6.5

70          212      5000        2.6

80          180      8000        1.6

90          160      10000       1.3