How to Use Mesh to Micron Converter
The Mesh to Micron Converter looks up and converts sieve sizes in two directions.
- Enter a Mesh Number — Type a US Standard mesh number (e.g. 40, 100, 200). The Mesh to Micron Converter returns the ASTM E11 nominal opening in microns (μm), millimetres, and inches.
- Or Enter Microns — Type a particle size in μm and the tool finds the nearest standard mesh number in the ASTM table.
- Read the Comparison Table — Adjacent mesh sizes are shown above and below your entry so you can choose finer or coarser grades.
- Check Tyler and ISO Equivalents — The result panel cross-references Tyler mesh and ISO 565 designations where they differ from ASTM E11.
Formula & Theory — Mesh to Micron Converter
The Mesh to Micron Converter provides both an approximate formula and the authoritative ASTM E11 table values:
Approximate formula (not a substitute for the standard):
opening (μm) ≈ 25,400 / mesh_numberExact relationship (wire diameter d_w in μm):
opening = (25,400 / mesh) − d_wASTM E11 Reference Values
| Mesh # | ASTM Opening (μm) | Approx. (25,400/mesh) | Wire Dia. (μm) |
|---|---|---|---|
| 10 | 2,000 | 2,540 | 900 |
| 20 | 850 | 1,270 | 510 |
| 40 | 425 | 635 | 290 |
| 100 | 150 | 254 | 110 |
| 200 | 75 | 127 | 53 |
| 400 | 38 | 64 | 30 |
US Standard vs. Tyler vs. ISO
ASTM E11 (US Standard), Tyler, and ISO 565/3310 use overlapping but not identical mesh designations. For regulatory or quality-control work, always refer to the applicable standard. This converter primarily follows ASTM E11.
Use Cases for Mesh to Micron Converter
The Mesh to Micron Converter is essential in any industry that processes powders or granular materials:
- Pharmaceutical manufacturing — API particle size is specified in both mesh and microns in pharmacopoeia standards; the converter bridges both systems during formulation and quality control.
- Food processing — Flour, sugar, spice, and starch grades are classified by sieve mesh; the Mesh to Micron Converter translates between buyer specifications and laboratory sieve designations.
- Mining and aggregate — Crushed rock, sand, and gravel are classified in both mesh and millimetres; the converter streamlines communication between lab and field.
- Powder metallurgy — Metal powder particle size for sintering, additive manufacturing, and thermal spray coatings is expressed in both mesh and microns depending on the supplier.
- Soil gradation testing — ASTM D6913 sieve analysis results reference US Standard mesh numbers; the converter produces the micron equivalents for international reporting.
- 3D printing resin and powder — Photopolymer resin particle filters and SLS powder specifications may use either mesh or micron units; the Mesh to Micron Converter reconciles the two.