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 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 8 - 12 Medium pored, medium-fast rate of filtration 1292 84 0.17 ≥30 5 - 8 Medium pored, moderately fast rate of filtration 1290 84 0.15 ≥30 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
(g/m2)
(mm)Wet Bursting
Strength (kPa)
retention (µm)<0.1 Refined pulp and Linters <0.1 Refined pulp and Linters <0.1
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.