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.
*Custom/bulk order quotes are provided within 24 hours of request.
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High-purity, Qualitative Filter Papers
Grade Material Weight Thickness 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 - 8 292 Cotton Linters 87 0.18 5 <0.06 5 - 8 292a Cotton Linters 97 0.19 5 <0.06 4 - 7 Medium to narrow pored, medium-slow rate of filtration
(g/m2)
(mm)Wet Bursting
Strength (kPa)
retention (µm)Medium pored, medium-slow rate of filtration Medium pored, medium-slow rate of filtration