Commercial polyamide membranes show Rp values in the range
between 1.1 and 2.0 1013 m1 for W-PA1 or 2.5 and
3.1 1013 m1 for W-PA2. Interestingly, as the pressure drop increases,
the Rp value for the electrospun membranes decreases,
whereas, for the commercial membranes, it increases.