Quantitative Filter Paper
These filter papers are used for quantitative and gravimetric analyses as well as for pressure or vacuum filtration. They are made out of 100 % cotton linters with an α-cellulose content of > 98 % and are acid-washed to make the papers ashless and achieve high purity.
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Quantitative Filter Paper
Grade Weight g/m² Thickness (mm) Filtration Time (s) Particle retention (µm) Precipitates Properties 388 (black dot) 84 0.21 10 12-15 Coarse crystalline Fast filtration 389 (white dot) 84 0.19 20 8-12 Medium-fine crystalline 392 (red dot) 84 0.17 50 5-8 Fine crystalline Medium-slow filtration 390 (green dot) 84 0.16 100 3-5 Fine crystalline Slow filtration 391 (blue dot) 84 0.15 180 Very fine crystalline Very slow filtration 393 (purple dot) 100 0.18 300 Very fine crystalline Very slow filtrationMedium-fast filtration, fat-free 2-3 1-2
These qualitative filter papers are essentially used for analytical purposes and routine analyses, whenever no gravimetric analyses are required. They are wet-strengthened and can be used for pressure and vacuum filtration. They are made of refined pulp and linters with an > 95% α-celluloose content, are very pure with an ash content < 0.1%.