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MN 640 dd is an ashless, slow filter paper which is slightly less retentive than MN 640 d
Equivalent to No. 44, blue label = green ribbon, slow 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 %.