Membrane Hydrophilic/ Hydrophobic Chemical Compatibility Protein Binding Flow Rate Applications Limitations PTFE (Polytetrafluoro- ethylene) Hydrophobic (can be hydrophilic) Excellent resistance to strong acids, bases, and organic solvents Very Low Moderate Filtration of aggressive organic solvents, gases, and non-aqueous samples Not suitable for aqueous solutions unless treated to be hydrophilic PES …