The very name Membrane Filter Media indicates, of course, thin materials, and with very small pores. When considering membrane filter media, choosing the right properties for it tailored to the application is of utmost importance. Following is a guide to making the right selections: The material(s) of construction must be inert to the fluid handled, as well as to the temperature employed. Other specific properties to measure, or know, are: thickness, porosity, permeability, and the viscose-flow-averaged pore diameter. Porosity refers to the ratio of void volume to bulk volume. Permeability, B, refers to the driving pressure to push a liquid through a medium in viscose flow, stated in Eq. 1.
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