Mar 01, 2021 · In particular, we compared the main properties of the PVDF/PSF membranes with the PVDF/PTFE membranes (previous work). The biggest mean pore size, porosity, and pure water flux of the PVDF/PTFE membranes were 0.317 μm, 42.6% and 99.2 L/m 2 h, respectively .