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MN 640 w is a fast, ashless filter paper. Recommended for analytical procedures involving coarse particles or gelatinous precipitates
Equivalent to No. 41, grey label = black ribbon, fast filtration, smooth. Ashless filter papers are particularly suited for quantitative routine analysis and are manufactured from refined pulp and linters. They are acid-washed and have an extremely low ash content of < 0.01 %. The amount of -cellulose is about 95 %.