The Polycarbonate Track-Etched membrane filters are made from a high-purity polycarbonate film using the Track-Etched process. Their capillary pore structure is uniform and precise. Track-Etched membrane filters are an excellent choice for fractionation of particles due to this precise pore size. As pure surface filters, they are best suited for all applications where certain particles must be retained on the membrane surface in order to be further analyzed. Application examples include particle analysis, epifluorescence microscopy, liquid clarification, cytology, cell biology, water microbiology and environmental analysis.