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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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Products (254)

Qualitative & Technical Papers, Smooth/ Grade 3 hw

$9.00

Grade
3 hw
Filter Format
Discs
Qualitative & Technical Papers, Smooth/ Grade 3 S/h

$7.50

Grade
3 S/h
Filter Format
Discs
Qualitative & Technical Papers, Smooth/ Grade 3 S/h

$9.00

Grade
3 S/h
Filter Format
Discs
Qualitative & Technical Papers, Smooth/ Grade 4 b

$6.60

Grade
4 b
Filter Format
Discs
Qualitative & Technical Papers, Smooth/ Grade 3 w

$45.00

Grade
3 w
Filter Format
Discs

Grade

Weight

(g/m²)

Thickness

(mm)

Filtration Time (s)

Particle
retention (µm)

Wet Bursting

Strength (kPa)

Color

Properties

10

120

0.33

8

11 – 16

 ≥ 30

White

Fast filtration of coarse precipitates

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

50 S

120

0.22

30

6 – 10

≥ 20

White

Medium-fast filtration, seed testing paper

100/N

85

0.18

30

6 – 8

≥  80

White

Medium-fast filtration, low ammonium, potassium & sodium content

3 h

65

0.13

35

6 – 9

≥ 15

White

Medium-fast to slow filtration

918

85

0.17

45

8 – 10

n.a.

Black

Medium-fast to slow filtration, black paper, stained with a sulfur coloring

460/N

90

0.17

50

3 – 4

≥ 30

White

Medium-fast to slow filtration of fine precipitates

3 S/h

200

0.36

55

5 – 7

≥ 15

White

Medium-fast to slow filtration

69 k

155

0.36

65

7 -9

≥ 20

Black

Slow filtration, black activated charcoal paper

Brochure

Filter Papers for the Laboratory and Industry
en 9.4 MB
Papiers filtres pour les laboratoires et l'industrie
fr 2.0 MB
Carte da filtro per il laboratorio e l'industria
it 1.9 MB
宣传手册:实验室过滤产品精简目录
zh 19.0 MB

Catalog

Laboratory Filtration Products
en 21.8 MB
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.

Wet-strengthened Filter Papers for Qualitative Analyses

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%.

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.