Dr Graham Rideal, managing director, Whitehouse Scientific, will deliver a paper at Filtech describing 'A new method of measuring pore size distributions using multi-modal particle size standards'.
The work is being presented as part of the session on Filter Media Characterization and describes a technique developed by Graham Rideal and Jamie Storey of Whitehouse Scientific in collaboration with Dr B Schied of BS-Partikel in Germany.
Whitehouse Scientific has developed a range of calibration microspheres for measuring pore sizes from more than 1,000 microns down to 0.1 microns.
Different systems of challenge testing are used depending on the filter cut points.
Above 20 microns, a high-speed dry Sonic Filter Tester is used, while a wet ultrasonic system takes the measurement down to two microns using a combination of microscopy and narrow size distribution silica microspheres.
In the sub-micron range a 'Multimodal' standard comprising of 10 non-overlapping latex microspheres in conjunction with a Disc Centrifuge can measure both filter cut points and pore size distributions.
Filtech is an international conference and exhibition covering filtration and separation technologies, which this year takes place from 13-15 October 2009 in Wiesbaden, Germany.
