These hydrophilic polycarbonate track-etched filters are manufactured from high quality polycarbonate film using track-etch technology. They have a sharply defined pore size of 0.4 µm with a pore density of  1.50E+08 cm². Pack of 100 white 47 mm discs that have a high chemical resistance and good thermal stability for accurate fractionation of particulates. Smooth, flat surface for good visibility.