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

Basis weight: 70 g/m2. Thickness: 0.16 mm. Filtration speed: 100 s/10 ml. Smooth. Ashless, slow filtration, for all fine precipitates. MN 640 dd is an ashless, slow filter paper which is slightly less retentive than MN 640 d.