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Filter, rund-, MN 640 d, 11,0 cm, 100 stk
Equivalent to No. 42, green label = blue 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 %.