Membrane circles white, 47 mm, mixed esters, 0.45 um, 3.1 mm black grid, sterile. In these products the microorganism counts are very low and are therefore determined quantitatively via enrichment methods.
For filtration of liquids from 0.5mL to 100mL. Filters are HPLC certified, nonpyrogenic and noncytotoxic. Sterile. Membrane is regenerated cellulose with 25mm diameter and 0.2um pore size. Manufactured according to ISO 9002 standards. Individual packaging.
Black Gridded, Sterile. Whatman black and green mixed ester membranes are composed of cellulose acetate (-20%) and cellulose nitrate (-80%). These membranes are characterized by a smoother and more uniform surface than pure nitrocellulose filters.