After 8 years of continued use, we are coming to the end of the current batch of 10-100um. Therefore we are introducing the PS411 series to replace the PS311 series.

Background
The Polydisperse Particle Standards were formally known as the BCR 'Mirror' Standards because they mirrored the size ranges of an official set of spherical reference standards that were being developed for the European Community (Community Bureau of Reference - BCR).

The 'Mirror' Standards were made both to assess the performance of the analytical laboratories and to augment a limited supply of the official standards.  Although sub-divided, the BCR samples were never certified, which leaves these new Polydisperse Particle Standards as the most comprehensively analysed set of spherical particle size reference standards available.

• Traceability through NIST, BCR and NPL standards
• Calibration for any method of particle size analysis
• One of the largest international teams ever assembled
• Unambiguous primary methods used - microscopy, sieving, sedimentation and the Coulter method

DISPERSION NOTES:
Samples dispersed for 5 minutes in an ultrasonic bath using a 0.1% deionised aqueous solution of sodium hexametaphosphate.

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