Smooth Filter Papers for Qualitative & Technical Analyses
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.
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Smooth Filter Papers for Qualitative & Technical Analyses
Grade Weight Thickness Filtration Time (s) Particle Wet Bursting Color Properties 6 80 0.17 15 10 - 13 ≥ 30 White Medium-fast filtration 3 w 65 0.14 15 9 - 13 ≥ 15 White Medium-fast filtration 3 hw 65 0.14 20 8 - 12 ≥ 15 White Medium-fast filtration C 140 140 0.30 20 7 - 11 > 50 White Medium-fast filtration 4 b 75 0.15 22 8 - 12 ≥ 30 White Medium-fast filtration 3 m/N 65 0.14 30 7 - 10 ≥ 30 White Medium-fast filtration 100/N 85 0.18 30 6 - 8 ≥ 80 White Medium-fast filtration, low ammonium, potassium & sodium content 918 85 0.17 45 8 - 10 n.a. Black Medium-fast to slow filtration, black paper, stained with a sulfur coloring 3 S/h 200 0.36 55 5 - 7 ≥ 15 White Medium-fast to slow filtration
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