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Nuclepore Polycarbonate (Hydrophilic) track-etched membranes are made from high quality polycarbonate film and have sharply defined pore sizes, high flow rates and excellent chemical and thermal resistance. These Whatman polycarbonate membranes have a smooth flat surface and exhibit very low levels of extractables. Low protein binding and low extractables ensure no sample contamination. Features high chemical resistance and good thermal stability for a wide range of samples. Low, consistent ash and tare weights. Membranes have a smooth flat surface for good visibility of particles. Diameter: 19mm. Pore Size: 0.05µm. 100/Pack. Whatman #: 800308.