MF-Millipore Membrane Filter, mixed cellulose esters, Hydrophilic, 1.0 µm, 47 mm, white, plain This 47 mm MF-Millipore membrane is composed of mixed cellulose membrane & has a 1.0 um pore size. With biologically inert mixtures of cellulose acetate & cellulose nitrate, MF-Millipore membranes are widely used in analytical/research applications.