Millex ® Syringe Filters with Hydrophilic PTFE Membranes. Millex ® Syringe Filters with Hydrophobic PTFE Membranes. Millex ® Syringe Filters with Hydrophilic Durapore ® PVDF Membranes. Millex ® Syringe Filters with PES Millipore Express ® Membrane. Millex ® Syringe Filters with Nylon Membranes.