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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Wet-strengthened Filter Papers for Qualitative Analyses
Grade | Material | Weight | Thickness | Wet Bursting Strength (kPa) | Ash content (%) | Particle | Properties |
|---|---|---|---|---|---|---|---|
1288 | Refined pulp and Linters | 84 | 0.21 | ≥30 | <0.1 | 12 - 15 | Wide pored, fast rate of filtration |
1289 | Refined pulp and Linters | 84 | 0.21 | ≥30 | <0.1 | 8 - 12 | Medium pored, medium-fast rate of filtration |
1292 | Refined pulp and Linters | 84 | 0.17 | ≥30 | <0.1 | 5 - 8 | Medium pored, moderately fast rate of filtration |
1290 | Refined pulp and Linters | 84 | 0.15 | ≥30 | <0.1 | 3 - 5 | Narrow pored, slow rate of filtration |
1291 | Refined pulp and Linters | 84 | 0.15 | ≥30 | <0.1 | 2 - 3 | Fine pored, very slow rate of filtration |
293 | Refined pulp and Linters | 80 | 0.15 | ≥20 | <0.1 | 1 - 2 | Very fine pored, very slow rate of 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.