Liquid filtration performance is commonly tested in a Multipass Filter Test Stand and is characterized by a Beta Rating, which indicates the particle size for a given filtration efficiency, a capacity, which indicates the service life of the media, and an initial resistance. Multipass Testing is a very complex and time consuming process. The Mean Flow Pore Diameter is a simple liquid displacement test that gives a good indication of the average pore size of a filtration media. This paper explores the correlation between the Beta rating, capacity, and initial resistance as measured using a Multipass Flat Sheet Filter Test Stand, the Mean Flow Pore Diameter as measured with a Porometer, and the permeability as measured by a Permeameter. The results indicate that the diameter rating for a given Beta Ratio is clearly proportional to the Mean Flow Pore Diameter, with a constant close to 1.0. The square root of the Permeability, a common measure related to initial resistance, is also proportional to the Mean Flow Pore Diameter. On the other hand, Flat Sheet Capacity is a very complex property, which can not be simply related to the Mean Flow Pore.
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