Oct 08, 2019 · Two different types of fluoropolymer-based membrane filter, polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) (n = 5 for each type), were acquired from different vendors namely Brand A, Brand T, original equipment manufacturer (OEM), and Brand P, with brands A, T, and OEM having a pore size of 0.22 μm and a diameter 13 mm