Macherey-Nagel Filter Papers, round, grade MN 640 de, 270 mm, 100 pcs.

Basis weight: 100 g/m2. Thickness: 0.2 mm. Filtration speed: 195 s/10 ml. Smooth. Ash free, very slow rate of filtration, for finest precipitates. MN 640 de is an ashless, very slow filter paper for the filtration of finest particles in quantitative range.