Particle Size Problem Solved
06 April 2005
With an ever increasing demand for precision and repeatability in particle size analysis, quality assurance laboratories are insisting upon an unambiguous source of calibration standards. Although Monodisperse standards have been used for many years, they are not suitable for testing the dynamic range of instruments used for typical polydisperse powders.
The major problem of using Polydisperse standards in the past has been producing samples in exactly the right weight for analysis. Sub-sampling of larger batches has been one of the most common sources of errors until now.
The problem has been resolved by Whitehouse Scientific with it's range of Polydisperse Particle Standards covering the size range 0.1 - 2000 microns. The seven grades available are bottled in a range of weights from 10mg to 10g so exactly the right dose is available for almost any particle sizing method.
This range of glass microspheres has been measured by one of the largest international teams ever assembled and all the data produced is directly traceable to international standards such as NIST. The primary methods of particle sizing used include sedimentation by gravity and centrifuge, microscopy, precision sieve analysis and the Coulter Counter method.
