What mesh size equals microns?
Short answer:
Mesh size does not directly equal microns, but it can be converted approximately. Mesh size refers to the number of openings per linear inch, while microns measure the actual opening size. For example, 60 mesh is approximately 250 microns, 100 mesh is about 150 microns, and 200 mesh is about 75 microns. Exact micron values depend on wire diameter and screen construction.
Understanding Mesh vs. Microns
Mesh size refers to the number of openings per linear inch of screen material. A 100-mesh screen has 100 openings per inch. As mesh number increases, opening size decreases.
Microns (µm) measure the actual clear opening between wires. One micron equals one-millionth of a meter. In screening applications, micron measurement provides a more precise indication of particle size separation than mesh count alone.
Because wire diameter varies, two screens with the same mesh number may have slightly different micron openings. This is why mesh count alone does not fully define screening performance.
Approximate Mesh to Micron Conversion Chart
| Mesh Size | Approximate Micron Opening |
|---|---|
| 20 mesh | ~850 microns |
| 40 mesh | ~425 microns |
| 60 mesh | ~250 microns |
| 80 mesh | ~180 microns |
| 100 mesh | ~150 microns |
| 140 mesh | ~106 microns |
| 200 mesh | ~75 microns |
| 325 mesh | ~45 microns |
These values are industry approximations and may vary slightly based on wire diameter and screen weave.
Why Mesh and Micron Values Are Not Exact Equivalents
Mesh count measures openings per inch, not opening width. Micron measurement describes the actual open space available for particles to pass through.
If thicker wire is used in a given mesh count, the micron opening becomes smaller. This directly impacts open area percentage and throughput capacity.
For precision screening applications, micron opening size is generally more reliable than mesh count.
How This Affects Screen Selection
When determining what mesh size vibratory screen you need, both mesh count and wire diameter must be evaluated.
- A fine mesh with thick wire reduces open area and limits capacity.
- A coarse mesh with thin wire may increase flow but reduce durability.
- Micron specification provides clearer separation targets for regulated or precision applications.
If replacing an existing screen, always confirm mesh count, wire diameter, and frame specifications before ordering.
Practical Decision Rules
- If particle size control is critical, specify micron opening instead of mesh number.
- If replacing an existing screen, confirm both mesh count and wire diameter.
- If regulatory compliance requires precise separation, use verified micron specifications.
Common Mistakes
Assuming mesh size and micron size are interchangeable can lead to incorrect screen selection and reduced separation accuracy.
Ignoring wire diameter differences may result in unexpected throughput limitations or blinding issues during operation.
Frequently Asked Questions
Is mesh size the same as microns?
No. Mesh size measures openings per inch, while microns measure the actual opening width.
Which is more accurate for screening?
Micron opening size is more precise because it reflects the actual clear space between wires.
Why do conversion charts vary slightly?
Differences in wire diameter and weave construction cause slight variation in micron equivalents.
Bottom Line
Mesh size and micron measurement describe different aspects of screen construction. Mesh indicates openings per inch, while microns measure the actual opening size. For precise separation, micron specification is more accurate, and conversion charts should be used as approximations rather than exact values.
