disc filter ptfe membrane filter 0.2 um South Africa Millipore® Filter Membranes - Sigma-Aldrich Isopore Membrane Filter, 0.2 µm pore size, hydrophilic polycarbonate membrane, 47 mm diameter Expand View Pricing NY2004700 Nylon Net Filter, 20.0 um pore size, hydrophilic nylon membrane, 47 mm diameter Expand View Pricing Page 1 of 23 Page 1 of