Nuclepore polycarbonate track-etched membrane is made from high quality polycarbonate film and has sharply defined pore sizes. It has high flow rates and excellent chemical and thermal resistance. The membrane has a smooth flat surface for good visibility of particles. Features include low protein binding and low extractables ensuring no sample contamination. Low, consistent ash and tare weights. Circle: 47mm. Pore Size: 0.015µm. 100/Pack. Whatman #: 111101.