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
(g/m2)

Thickness
(mm)

Filtration Time (s)

Particle
retention (µm)

Wet Bursting
Strength (kPa)

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