Mesh Count
170
Openings per linear inch
Sifting Solutions
170 mesh corresponds to a nominal opening of 90 microns (0.090 mm). In botanical screening, this is generally treated as a fine separation step for dry sift, pollen, and powder handling lines.
Mesh Count
170
Openings per linear inch
Opening
90 microns
0.090 mm
Opening Inch
0.00354
Nominal clear opening
Open Area
36.2%
Wire diameter 0.059 mm
| Mesh count | 170 |
|---|---|
| Nominal opening (micron) | 90 microns |
| Nominal opening (millimeter) | 0.090 mm |
| Nominal opening (inch) | 0.00354 in |
| Nominal wire diameter | 0.059 mm |
| Nominal open area | 36.2% |
A 170 mesh screen is built with 170 openings per linear inch. For this reference, the clear opening is listed at 90 microns, with a nominal wire diameter of 0.059 mm and an open area near 36.2%. These values are used for engineering comparison, not as a substitute for final supplier drawings.
At 90 microns, this screen size tends to tighten the cut point so finer resin-rich fractions can be graded with less oversized carryover. In production terms, it sits in the 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
0.090 mm x 1000 = 90 microns
mm from micron
mm = micron / 1000
90 / 1000 = 0.090 mm
Inch conversion
inch = micron / 25400
90 / 25400 = 0.00354 in
Process notes are assembled directly from the selected opening value so each page stays consistent with the table above.
When a 170 mesh screen is used for pollen collection, the nominal opening is 90 microns. This range is typically reserved for selective finishing passes where very fine particulate control is required.
For dry sift separation, 170 mesh gives a nominal clear opening of 90 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, 170 mesh is roughly equivalent to 90 microns. This opening fits controlled grading steps where mid-size powder fractions need to be standardized before packaging or blending.
For botanical pre-screening, a 170 mesh cloth opens at about 90 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.
160 mesh at 95 microns will pass a coarser cut and hold higher throughput. 180 mesh at 80 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.