Ultipor* N66 Membrane Filter Disc. 47mm diameter. Pore size: 0.45um. Nylon 6,6 filter. Reinforced single layer with nonwoven internal polyester. Used in sterilization, HPLC and other fine filtration of small volume aqueous, alcohol, and organic solvent solutions. 15sq.cm filtration area. Part for Pall Silt Density Index Kit, SDIKIT1.