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635 mesh to micron: 20 µm (0.02 mm)

635 mesh is an opening of 20 microns, which is 0.02 mm or 0.000787 inch, on the ASTM E11 US standard sieve series. That is finer than the finest wedge wire slot we make, 25 microns (0.025 mm); ask us what suits a separation this fine.

Mesh sizes follow the ASTM E11 US standard sieve series. Between listed sieves the mesh is interpolated and marked "about".

Opening20 µm

Millimetres
0.02 mm
Inches
0.0007874 in
Thou (mil)
0.7874 thou
Mesh
635 mesh
Nearest coarser sieve
635 mesh, 20 µm
Nearest finer sieve
635 mesh, 20 µm

Equivalent wedge wire slot: 20 micron (0.02 mm)

Wedge wire is specified by its slot directly, so a wedge wire screen has no mesh count. Quote the slot in mm or microns.

Your inputs and results go into the quote form, so an engineer can check them against your operating conditions.

Nearby sizes

Mesh sizes near 635 mesh

MeshMicron (µm)mm
200 mesh750.075
230 mesh630.063
270 mesh530.053
325 mesh450.045
400 mesh380.038
500 mesh250.025
635 mesh200.02

Swipe sideways to see the whole table.

What passes through 635 mesh

As a general reference on the Wentworth grade scale, particles smaller than 20 µm pass: clay. Real separation also depends on particle shape, the screen's open area and how the screen is loaded.

The wedge wire equivalent

That is finer than the finest wedge wire slot we make, 25 microns (0.025 mm); ask us what suits a separation this fine. Because the V-shaped wire widens behind the slot, particles that pass the face do not wedge in it. See mesh to micron and slot size and how to choose slot and open area.

Ask an engineer about this size

Our engineers will connect with you within a working day. Fill in what you know; "Not sure" is a fine answer. Fields marked are needed.

What you need
Medium, flow, temperature, pressure, or what goes wrong with the current screen.
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