滤膜中的绝对孔径和名义孔径

beiwei5du

大家好！想咨询一下滤膜中的“绝对孔径”和“名义孔径”分别是指什么呢？？？

wangqiang1985

名义孔径应该是只滤膜孔径的一个大概均值吧，无法确保除菌过滤效果；而绝对孔径应该是根据实际能够剔除的最小直径微粒来确定的，也就是说，如果绝对孔径是0.22um的话，就意味着比这个大的微粒都无法通过该滤膜。个人见解哈

beiwei5du

What is the difference between absolute and nominal?
Nominal filter ratings are an arbitrary value, indicating a particulate size range at which the filter manufacturer claims the filter removes some percentage. Nominal ratings vary from manufacturer to manufacturer and cannot be used to compare filters among manufacturers. Processing conditions such as operating pressure and concentration of contaminant have a significant effect on the retention efficiency of the nominally-rated filters.
Absolute filter ratings are a value associated with a filter that represents the size of the smallest particle completely retained. Complete retention is within the experimental uncertainty of a standard test method consistent with the intended filter use. Among the test conditions that must be specified are test organism (or particle size), challenge pressure, concentration, and detection method used to identify the contaminant
https://laboratory.pall.com/content/dam/pall/laboratory/literature-library/non-gated/id-36916.pdf

The absolute rating shouldn't be confused with the largest particle passed by a filter under operating conditions: the absolute rating simply determines the size of the largest glass bead which will pass through the filter under very low pressure differentials and nonpulsating conditions.

Read more: http://www.lenntech.com/library/fine/absolute/absolute-nominal-filters.htm#ixzz4oleUmqq7