These beads are particularly useful as general purpose research microspheres or spacer beads in a range of lower grade applications. They may also be used as a preliminary material with which to assess the performance of particle size equipment, after which a higher specification traceable standard may be used as the final calibrant.  Please note that there may be slight variations from batch to batch.

In the first stage of refinement, broad distribution glass microspheres are very accurately sieved using a variety of sieving processes to produce extremely sharp cuts from 75µm to 3.5mm.  The process aims to leave approximately 80% of the distribution within the nominal size range.  Every sieve used in the process is calibrated against international standard such as NIST or NPL so there is no possibility of any errors arising from the use of incorrectly labelled sieve meshes. However, the complete particle size distribution of this product is not traceable other than to the start and finish points of the distribution.

Specific certificates cannot be reissued.
It is against our Quality Policy as we cannot guarantee how the standards have been stored once leaving our facility. We would recommend making a photocopy/scanning the certificate upon receipt to avoid issues if lost. However reference copies of our Certificates can be downloaded from our Certificate Bank.