Mesh Count
280
Openings per linear inch
Sifting Solutions
280 mesh corresponds to a nominal opening of 52 microns (0.052 mm). In botanical screening, this is generally treated as a ultra-fine separation step for dry sift, pollen, and powder handling lines.
Mesh Count
280
Openings per linear inch
Opening
52 microns
0.052 mm
Opening Inch
0.00205
Nominal clear opening
Open Area
32.9%
Wire diameter 0.039 mm
| Mesh count | 280 |
|---|---|
| Nominal opening (micron) | 52 microns |
| Nominal opening (millimeter) | 0.052 mm |
| Nominal opening (inch) | 0.00205 in |
| Nominal wire diameter | 0.039 mm |
| Nominal open area | 32.9% |
A 280 mesh screen is built with 280 openings per linear inch. For this reference, the clear opening is listed at 52 microns, with a nominal wire diameter of 0.039 mm and an open area near 32.9%. These values are used for engineering comparison, not as a substitute for final supplier drawings.
At 52 microns, this screen size tends to shift the process toward laboratory-style classification where particle size control matters more than open throughput. In production terms, it sits in the ultra-fine part of the screening range and is usually selected after operators define the target fraction, feed dryness, and deck loading rate.
These formulas explain the unit relationship shown in the table.
Micron from mm
micron = mm x 1000
0.052 mm x 1000 = 52 microns
mm from micron
mm = micron / 1000
52 / 1000 = 0.052 mm
Inch conversion
inch = micron / 25400
52 / 25400 = 0.00205 in
Process notes are assembled directly from the selected opening value so each page stays consistent with the table above.
When a 280 mesh screen is used for pollen collection, the nominal opening is 52 microns. This range is typically reserved for selective finishing passes where very fine particulate control is required.
For dry sift separation, 280 mesh gives a nominal clear opening of 52 microns. At this point the screen is acting as a fine classification layer, so feed consistency and blinding control become more important.
In powder grading work, 280 mesh is roughly equivalent to 52 microns. This level is more appropriate for fine powder classification, test work, and controlled laboratory evaluation.
For botanical pre-screening, a 280 mesh cloth opens at about 52 microns. At this fineness the screen is no longer a rough pre-screen. It becomes a precision control point inside a multi-stage grading workflow.
270 mesh at 53 microns will pass a coarser cut and hold higher throughput. 300 mesh at 48 microns will shift the cut point finer and tighten material control.
Nominal opening values were curated from commonly referenced industrial wire cloth and U.S. sieve conversion charts. Actual clear opening can vary by weave style, wire diameter, and manufacturing tolerance.
Nominal opening values may vary slightly by weave and wire diameter. For purchase approval, always confirm the actual cloth specification issued by the manufacturer.