Structure and performance of filter media. I. The internal structure of filter media

Abstract

Abstract The internal structure of various types of filter media and the nature of fluid flow through them are examined. Methods of characterizing the internal pore structure of filter media are reviewed, and the permeability, bubble‐pressure, and mercury‐intrusion methods are applied to ten typical media, with resulting values of average and maximum pore radius and pore‐size distribution being reported. These data on internal pore structure are related to the construction variables characteristic of the media examined, in particular the effect of yarn construction, yarn twist, fabric weave, and fabric finish on textile‐type filter media.