High-purity, Qualitative Filter Papers
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.
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These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
These filter papers are especially suitable for qualitative analyses that require a low ash content.
High-purity, Qualitative Filter Papers
Grade | Material | Weight | Thickness | Wet Bursting Strength (kPa) | Ash content (%) | Particle | Properties |
|---|---|---|---|---|---|---|---|
131 | Refined pulp and Linters | 80 | 0.16 | 20 | <0.02 | 3 - 5 | Narrow pored, slow rate of filtration |
132 | Refined pulp and Linters | 80 | 0.17 | 20 | <0.02 | 5 - 8 | Medium pored, medium-slow rate of filtration |
292 | Cotton Linters | 87 | 0.18 | 5 | <0.06 | 5 - 8 | Medium pored, medium-slow rate of filtration |
292a | Cotton Linters | 97 | 0.19 | 5 | <0.06 | 4 - 7 | Medium to narrow pored, medium-slow rate of 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%.