White, hydrophilic polycarbonate track-etch-membranes manufactured from high grade polycarbonate film using track-etch technology. Capillary pore structure is uniform and precise, with a narrow pore size distribution to retain particles on the surface. Track-etch membranes are an excellent choice for accurate fractionation of particulates because of their precise pore size. Track-etch technology offers the user distinct performance advantages when excellent surface capture and high sample visibility are required. Their main applications are particulate analysis, epifluorescence microscopy, fluid clarification, cytology, cell biology, bioassays, water microbiology and environmental analysis.