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

Basis weight: 85 g/m2. Thickness: 0.17 mm. Filtration speed: 140 s/10 ml. Smooth. Ashless, slow filtration, for fine and very fine precipitates. MN 640 d is an ashless, slow filter paper with very fine particle retention. Standard paper for critical gravimetric analysis of fine precipitates like barium sulfate or metastannic acid.