Whitehouse Scientific is relied upon around the world as a provider of high quality particle sizing standards and calibration microspheres, and will exhibit its unique range of filter calibration products and services at the 11th World Filtration Congress in Graz, Austria  from 16-20 April 2012.

This will include details of Whitehouse Scientific’s method for determining the cut point of filter media. Using specially prepared, precision glass microspheres to challenge the filter, it is possible to measure filter efficiencies within micron resolutions. The Whitehouse Scientific method uses narrow particle size distribution standards and covers pore sizes from just a few microns to more than 600 microns. Results are highly reproducible and traceable to international standards, NIST for example.

According to Jamie Storey, Managing Director of Whitehouse Scientific, “As the  name suggests, challenge testing involves challenging the surface of a filter with actual particles. Particle sizes are then measured upstream and downstream of the filter. The maximum size passing through reflects the largest pore size. Challenge testing is one of the most robust methods of filter testing because we use spherical particles analysed by microscopy, where any out of shape particles can be eliminated.”