Qorpak offers several styles of Whatman® Membrane Filters including Nuclepore® track-etched polycarbonate membranes which are manufactured from high quality polycarbonate film and have sharply defined pore sizes, high flow rates and excellent chemical and thermal resistance. High-quality nylon membranes are suitable for filtering aqueous solutions and most organic solvents. Cellulose Nitrate Membrane are recommended for the majority of routine applications, this grade is manufactured under strictly controlled clean room conditions.