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Large sieve opening (1 to 1/4 inch) have been
designated a sieve "mesh" size that corresponds to the
size of the opening in inches.
Sieve "mesh" sizes of 31/2 and higher
are designated by the number of openings per linear inch in the
sieve.
Special conventions apply to particle sizing by
mesh designation. A "+" before the sieve mesh indicates
that all particles are too large to pass through the sieve; a "–"
denotes complete passage of material through the sieve. For example,
the particle size of a material may be described as –4 +40 mesh,
meaning the material goes through a 4-mesh sieve (particles are
smaller than 4.76 mm) but remain on the 40-mesh sieve (particles are
larger than 0.420 mm).
Note: To convert millimeters to microns,
move decimal point three places to the right. Example: 0.125
millimeters converts to 125 microns.
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