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MN 618 is a thick filter paper with medium flow rates and finer retention. It's higher loading capacity than thinner papers makes it especially useful for the filtration of large quantities of liquids.
Equivalent to No. 3, medium fast filtration, smooth. Qualitative filter papers are manufactured from the same raw materials as the ashless grades and are particularly suited for general laboratory filtrations. The average ash content is about 0.1 %, the amount of a-cellulose is about 95 %.