Yet another sterilizing grade filter with a PES (Polyethersulfon) membrane has been launched. Cuno, as all other filter manufacturer, claim it is the best performing filter. It probably has a great performance due to the asymmetric membrane structure of PES, but also a unique pleat structure, which increases the filter area within the same 10" filter dimension.
The question one has to post, after the launch of now 20 new sterilizing grade membrane filters, 19 of them with a PES membrane and 1 with a hybrid structure of PES/PVDF, is PES becomeing the standard membrane polymer ? Probably, drift to PES will be prevalent as the membrane material is robust and can be modified easily. However, different membrane polymers are needed for different applications.
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