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HomeLaboratory Filter PaperBoeco Quantitative FiltersQuantitative Filters - 391 - blue spot

Quantitative Filters - 391 - blue spot

Quantitative Filters - 391 - blue spot

391 - blue spot - very slowly filtering, fine pores, ashless hardened

quantitative ashless filter papers are recommended for quantitative analysis.
As quantitative analysis requires a high purity, these filters are being washed out with acid. 

Fine-grained precipitates such as

  • barium sulphate
  • metannic acid
  • cupros oxide
Basis Weight: 84 g/m2
Filtration velocity: 10 ml / 180 seconds
Typical Pore Size: 2 - 3 µm
Similar to: Whatmann 44, S&S 589/3, M-N 640de

Diam. Code Grade/Description Pack of
55 mm FTR 3.104.055 391 / Filter discs. Green dot 100
70 mm FTR 3.104.070 391 / Filter discs. Green dot 100
90 mm FTR 3.104.090 391 / Filter discs. Green dot 100
110 mm FTR 3.104.110 391 / Filter discs. Green dot 100
125 mm FTR 3.104.125 391 / Filter discs. Green dot 100
150 mm FTR 3.104.150 391 / Filter discs. Green dot 100
185 mm FTR 3.104.185 391 / Filter discs. Green dot 100
240 mm FTR 3.104.240 391 / Filter discs. Green dot 100

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