Jul 01, 2020 · In addition, PTFE membrane type presents higher strength over nylon and more effective filtration, as it was shown from preliminary experiments. In present work, a PTFE/hydrophilic membrane type syringe filter was adopted. It was fabricated by polypropylene housing material, with 25 mm filter size, 4.0 cm 2 filter area and 0.45 μm pore size