The Millipore Express PLUS membrane provides ultrafast filtration of tissue culture media, additives, buffers and other aqueous solutions. This high-throughput, low-protein-binding membrane is also used in many of our ready-to-use sterile filtration devices. Millipore express trade. Filter material: Polyethersulfone. Media brand name: Millipore Express PLUS. Water Flow Rate, mL/min x cm squared: 15 at 690 mbar (10 psi). Bubble Point at 23 degree C: >=1.38 bar, air with water. Filter type: Screen filter. Pore Size (?m): 0.22. Filter Diameter, mm: 47. Filter code: GPWP. Filtration device and accessory type: Filter Discs/Sheets. Bacterial endotoxins: Aqueous extraction contains <=0.5 EU/mL as determined by the Limulus Amebocyte Lysate (LAL) Test. Thickness, ?m: >=150 and <=200.