Sieves can be calibrated precisely and economically, using soda lime glass microspheres. This method has the advantage of quick calibration without any special equipment, and can be done by anyone familiar with sieving procedures. 

This process allows for analysis of over 80% of the sieve surface. The glass sample beads are certified using electroformed sieves NIST & NPL traceable and are accurate to .01 mm for the smaller aperture sieves.
SIEVE CALIBRATION GLASS MICROSPHERES
The calibration samples are microspheres formed from soda lime glass, that range from 3.35 mm down to 20 µm sizes.  The single shot bottles remove operator sampling errors.  Each sample batch is supplied with a Calibration Certificate.
              PROCEDURE:  

Simply read off the percentage passing along a graph like this supplied with every sample.
The mean aperture size in micrometers can be read off here against the graph.
SIEVE CALIBRATION BEADS
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2) SIEVE DIAMETER

    US                               INCHES
    INTERNATIONAL          MILLIMETERS

3) APERTURE SIZE         MILLIMETERS
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MOISTURE, PARTICLE CHARACTERIZATION, COLOR, AND SAMPLING
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Telephone (804) 435-5522
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METHOD TO CALIBRATE SIEVES
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