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

Basis weight: 85 g/m2. Thickness: 0.2 mm. Filtration speed: 55 s/10 ml. Smooth. Ashless, medium rate of filtration, for example, for magnesium ammonium phosphate, zinc sulfide, etc. MN 640 md is an ashless filter paper, which is slightly more retentive than MN 640 m with corresponding increase in filtration time.