Corning bottle-top vacuum filters, pore size 0.22 um bottle Corning® bottle-top vacuum filters cellulose acetate membrane, sterile, pore size 0.22 μm, membrane diam. 70 mm, funnel capacity 500 mL, case of 12; Synonyms: bottle top filters,vacuum system filters,laboratory filters; find -CLS430513 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich