Abstract
Characterization of membrane porosity is important to evaluate separation efficiency. Through pore size relate to separation size, permeation rate relate to efficiency of separation. Now a day, we have two permporosimetry techniques for evaluation these pore. One is bubble point method by pressure which can determine 15 nm ～ 500 μm in pore diameter. Another technique is permporometry method by changing vapor pressure which can detect 0.5 ～ 50 nm pore size.
