Macherey-Nagel PORAFIL Membrane Filters CM are high-quality filters designed for efficient and precise filtration in laboratory and industrial applications. Manufactured by Macherey-Nagel, these filters feature a 0.45 µm pore size, ensuring effective particle retention for reliable sample analysis. The 50 mm diameter filters are made from mixed cellulose ester (MCE) material and come with a black grid on a white background, making them ideal for various filtration processes such as microbiological testing, water analysis, and chemical filtration.