Devices Millex® syringe filters, Millipak® filters, MultiScreen® plates, Stericup® filters, Steritest™ devices, Sterivex™ filters, Ultrafree® filter units, filter discs Millipore Express® PLUS Membrane Brand Name Millipore Express® PLUS Membrane Membrane Material Polyethersulfone (PES) Pore Sizes (µm) 0.22, 0.45 Thickness (µm) 130