Mesh (scale)

The mesh is a unit of the mesh size in many English-speaking countries (see Anglo-American system of measurement ) and is mainly used for sieves. Simultaneously, the mesh also referred to the grain size of corresponding screened material.

The English word means stitch. A value of 5 has a mesh screen having five stitches per inch (25.4 mm). Since the thickness of the laths have to be taken into account, corresponding to 5 mesh, however, not a particle size of one-fifth inch (5.1 mm), but a 4.0 mm (ie 78% of 1/5 inch ). A grain size of 10 mesh corresponding to a particle diameter of 2.0 mm. For large mesh numbers, there are significant differences between the grain sizes depending Assuming a standard. Thus, equivalent to 100 mesh ( one stitch each 0.254 mm), although often a particle size of 0.149 to 0.150 mm (59 %), but can also, depending on the purpose, authority and country, for example, with 0.162 mm ( 64%, FEPA standard for P100 abrasive papers ), 0.129 mm ( 51%, FEPA standard F100 for abrasive ) or 0.125 mm (49%, must be established by J100 Japanese standard JIS R6001 ). Abrasive with grain sizes of about 0.013 mm are associated at all the mesh based on designations P1500 ( 77%), F600 ( 31%) and J1200 ( 61%). The number of stitches per inch varies here almost by a factor of 3 A comparison without a matching table or exact knowledge of the standards is then no longer possible. Assuming a maximum error of 25 % into account, then the grain sizes between 5 and 100 can be well estimated mesh but with 16.2 mm divided by the mesh value.

To convert mesh in millimeters, there are no formulas, but in the respective sub-standard tables.

The mesh number is also used for the classification of screen printing fabrics.

In reticular tissues, for example mosquito nets, the number of openings per unit area is often specified in mesh per square inch, and not as a reciprocal length, rather than reciprocal space.