Ashless filter papers

For quantitative analysis and filtration with low blank values

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 a-cellulose is about 95%.
 

Ashless filter paper grades

  MN 640 we Very fast filtration, ashless, for fast filtration of very coarse precitpitates.
  MN 640 w
≡ black ribbon, No. 41
Fast filtration, ashless, for fast filtration of coarse precipitates.
  MN 640 m
≡ white ribbon, No. 43
Medium fast filtration, ashless, standard filter for many applications.
  MN 640 md   
≡ red ribbon, No .40
Medium fast filtration, ashless, for example for magnesium-ammonium-phosphate and zinc sulfide.
  MN 640 dd
≡ green ribbon, No. 44
Slow filtration, ashless, for filtration of fine precipitates.
  MN 640 d
≡ blue ribbon, No. 42
Slow filtration, ashless, for filtration of very fine precipitates.
  MN 640 de    Very slow filtration for extremely fine precipitates.