Optiscale® Capsule Filter Durapore® sterile, filtration area 3.5 cm2, pore size 0.45 μm; Synonyms: Durapore 0.45 μm Optiscale 25mm NB; find Millipore-SPHLA25NB6 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich