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.