MF-Millipore™ Membrane Filter, 0.45 µm Pore Size. Membrane Filter, 0.45 µm Pore Size, White, Mixed Cellulose Esters, 25 mm dia, 150 µm Thickness, Plain Filter Surface, 1.51 Refractive Index, MF-Millipore™ Media, Hydrophilic Wettability, 75°C Maximum Operating Temperature. Manufacturer Part #: HAWP02500. SECO Part #: HAWP02500.