PTFE membrane filter for hplc Merck Polyvinylidene Fluoride (PVDF) Membrane (Hydrophilic) – Hydrophilic PVDF Membrane Exhibits Extremely Low Protein Binding 2.5 L of PBS containing 100 µg/mL BSA and approx 100k cpm/mL 125 I-labeled BSA was perfused through 13 mm discs.