1. What is Mesh Size:
Mesh size means how many opening in one linear inch of screen. For example, A 20 mesh screen has 20 openings per inch while A 100 mesh screen has 100 openings per inch, and so on. There are several mesh size systems available but varies slightly. In this article, we are talking about US standard mesh size.
The mesh number indicates higher the mesh number, finer the particle size. However, mesh size is not a precise particle size, but it gives us ground to compare particles size from different sources. In mass finishing, we use mesh size to measure abrasive grit as it related to media abrasiveness.
2. Mesh Size related to abrasiveness:
Bigger mesh number means finer particle grit, which leads to low abrasiveness. In contrast, smaller mesh number means courser particles grit, which provides higher cutting power. In mass finishing tumbling media, we use mesh size to compare media aggressiveness.
Ceramic media with higher cutting power is ideal for deburring and material removal. But it also leaves a rougher surface.
Plastic media with a lower cutting power well performance for smoothing softer metal. Therefore, it creates a surface with a low Ra value.
|Mesh Size||Grit Size||Abrasiveness||Function|
|Big Mesh number||1200 (for example plastic media)||6um||Low||Polishing, Smoothing|
|Small Mesh number||320 (for example ceramic media)||36um||High||Deburring|
Table illustration of mesh size in relation to tumbling media abrasiveness
A study has been made by (Moore 1974; Nathan & Jones 1966) regarding “Effect of grain size on stock removed for abrasive wear studies”. We can compare the cutting power for different abrasive size against the main metal categories.
3. Mesh Conversion Chart
The table below shows us mesh size conversion with micron and inches. These values are basically correct and mesh wire is based on the American National Standard wire cloth to get the value.
Standard ASTM E11-17, ISO 565-1990, and ISO 3310-1:2016 sieve specifications.
Note: (American Standard ASTM-E 11)