Whatman Nuclepore Polycarbonate Black Membrane Filter, 0.2 µm Pore Size, 25 mm Circle, 100 Pack, 110656. Regular Price $155.69 Price $135.38. Add to Cart. Whatman Nuclepore Hydrophilic Membrane, 0.2 µm Pore Size, 8 x 10 in sheet, 25 Pack, 10417050. Regular Price $833.64 Price $724.90.