Wet-strengthened Filter Papers for Qualitative Analyses
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%.
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Products (137)
Grade | Weight (g/m²) | Thickness (mm) | Filtration Time (s)* | Particle | Precipitates | Properties |
1288 | 84 | 0.21 | 10 | 12 - 15 | Coarse crystalline | Fast filtration |
1289 | 84 | 0.21 | 20 | 8 - 12 | Medium-fine crystalline | Medium-fast filtration |
1292 | 84 | 0.17 | 50 | 5 - 8 | Fine crystalline | Medium-slow filtration |
1290 | 84 | 0.15 | 100 | 3 - 5 | Fine crystalline | Slow filtration |
1291 | 84 | 0.15 | 180 | 2 - 3 | Very fine crystalline | Very slow filtration |
293 | 80 | 0.15 | 300 | 1 - 2 | Very fine crystalline | Very slow filtration |
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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.