When we are working with a customer to design a new porous material, the first two criteria we often look at are (1) the efficiency (how much of the particulate are we going to capture, usually expressed as a % [1 – penetration%]) and (2) the resistance caused by the material as the filtrate flows through the filter. (2) is often expressed as pressure drop, air perm or flux, but it is really an expression of the energy, or cost, of filtering the material.
These two measures are combined by most of the large filter, media and membrane manufactures into some kind of quality factor – often referred to as Alpha. It really boils down to two big questions:
How much of the material am I going to catch?
[Correct Answer = as much as possible.]
- How much am I going to spend to catch it?
[Correct Answer = as…
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