Membrane filters have a well-defined pore size exclusion limit (available with 1, 3, 5 and 8 um pores), allowing for precise filtration and detection of very small particles. The membranes are non-hygroscopic (optimal for sample recovery), have low non-specific protein binding (reduces sample loss in protein-containing samples), are biologically inert, non-cytotoxic, and have excellent chemical and temperature resistance. The membrane filters can be used for example in biological or gravimetric analysis, cytology, parasitology or in environmental analyzes.