Crêped Filter Papers for Qualitative & Technical Analyses
Crêped filter papers are mostly used for the rapid filtration of relatively coarse precipitates; because of their crêped structure they provide a larger filtration area than smooth filter papers. Grades with a wet burst resistance > 30 kPa are referred to as wet-strengthened and are therefore suitable for pressure or vacuum filtration.
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Crêped Filter Papers for Qualitative & Technical Analyses
Grade Weight Thickness(mm) Filtration Time (s) Wet Bursting Strength (kPa) Air Resistance (mbar) Properties 5 H/N 85 0.28 3 ≥ 40 n.a. Very fast filtration, wide-pore 34/N 60 0.20 4 ≥ 50 2.0 Very fast filtration 37/N 135 0.50 4 ≥ 70 1.9 Very fast filtration, wide-pore 1602/N 70 0.23 5 ≥ 30 n.a. Very fast filtration 39/N, 180 g 180 0.65 5 ≥ 90 2.5 Very fast filtration, wide-pore 39/N, 300 g 300 0.95 5 ≥ 120 2.5 Very fast filtration, wide-pore 603/N 75 0.25 8 ≥ 50 n.a. Fast filtration 6 S/N 145 0.55 12 ≥ 90 n.a. Medium-fast filtration 601/N 65 0.19 13 ≥ 30 n.a. Medium-fast filtration, 67/N, 160 g 160 0.65 13 ≥ 60 5.5. Medium-fast filtration
(g/m2)
for sugar industry
These filter papers are used for routine analyses like clarification, determination of substances, but also as discs with a center hole for technical applications. Grades with a wet burst resistance > 30 kPa are referred to as wet-strengthened and are therefore suitable for pressure or vacuum filtration. White and bright particles can be easily detected with the black paper grade 918, due to the color contrast for example for the detection of fluorine or silicon in water or the detection of mycelium in mildews.