Smooth Filter Papers for Qualitative & Technical Analyses
These filter papers are used for routine analyses like clarification, determination of substances, but also as discs with a center hole for technical applications. Grades with a wet burst resistance > 30 kPa are referred to as wet-strengthened and are therefore suitable for pressure or vacuum filtration. White and bright particles can be easily detected with the black paper grade 918, due to the color contrast for example for the detection of fluorine or silicon in water or the detection of mycelium in mildews.
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Smooth Filter Papers for Qualitative & Technical Analyses
Grade | Weight | Thickness | Filtration Time (s) | Particle | Wet Bursting | Color | Properties |
|---|---|---|---|---|---|---|---|
6 | 80 | 0.17 | 15 | 10 - 13 | ≥ 30 | White | Medium-fast filtration |
3 w | 65 | 0.14 | 15 | 9 - 13 | ≥ 15 | White | Medium-fast filtration |
3 hw | 65 | 0.14 | 20 | 8 - 12 | ≥ 15 | White | Medium-fast filtration |
C 140 | 140 | 0.30 | 20 | 7 - 11 | > 50 | White | Medium-fast filtration |
4 b | 75 | 0.15 | 22 | 8 - 12 | ≥ 30 | White | Medium-fast filtration |
3 m/N | 65 | 0.14 | 30 | 7 - 10 | ≥ 30 | White | Medium-fast filtration |
100/N | 85 | 0.18 | 30 | 6 - 8 | ≥ 80 | White | Medium-fast filtration, low ammonium, potassium & sodium content |
918 | 85 | 0.17 | 45 | 8 - 10 | n.a. | Black | Medium-fast to slow filtration, black paper, stained with a sulfur coloring |
3 S/h | 200 | 0.36 | 55 | 5 - 7 | ≥ 15 | White | Medium-fast to slow filtration |
These paper grades are used for analytical purposes that require a low ash content.
Grades 292 and 292a are especially suitable for soil analyses because they are low in nitrogen. For phosphate or sodium determination, we recommend grades 131 and 132.
Crêped filter papers are mostly used for the rapid filtration of relatively coarse precipitates; because of their crêped structure they provide a larger filtration area than smooth filter papers. Grades with a wet burst resistance > 30 kPa are referred to as wet-strengthened and are therefore suitable for pressure or vacuum filtration.
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%.