Iso-Disc™ Syringe Tip Filter Unit Nylon membrane, pore size 0.45 μm, diam. 13 mm, orange, pkg of 50 ea; Synonyms: PK50 Iso-Disc™ N-13-4,NYLON,13MM X 0.45UM; find Supelco-54134U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich