SIEVE CALIBRATION STANDARDS 
Sieves can be calibrated precisely and economically using Endecotts 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.
The calibration samples are microspheres formed from 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
Calibration Sample Procedure:  

Select the calibration sample size that matches the sieve aperture size.

Simply read off the percentage passing along a graph like this supplied with every sample.
SODA LIME GLASS SIEVE CALIBRATION SPHERES
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EACH SET CONTAINS 5 BOTTLES
Recommended number of bottles per sieve

SIEVE DIAMETER

200mm or 8 inches                      1 bottle
300mm or 12 inches                    2 bottles  
450mm or 18 inches                    5 bottles
SIEVE CAL
NEW AUTOMATIC SIEVE CALIBRATOR
METHOD INSTRUCTIONS