These filter papers are used for quantitative and gravimetric analyses as well as for pressure or vacuum filtration. They are made out of 100 % cotton linters with an α-cellulose content of > 98 % and are acid-washed to make the papers ashless and achieve high purity.

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Quantitative Filter Paper

Choose the correct quantitative filter papers:

Grade  

Weight g/m²

Thickness (mm)

Filtration Time (s)

 Particle retention (µm)

Precipitates

Properties

388 (black dot)  

 84

0.21

10

12-15

Coarse crystalline

Fast filtration

389 (white dot)

 84

0.19

20

8-12

Medium-fine crystalline

Medium-fast filtration, fat-free

392 (red dot)

 84

0.17

50

5-8

Fine crystalline

Medium-slow filtration

390 (green dot)

 84

0.16    

 100

3-5

Fine crystalline

Slow filtration

391 (blue dot)

 84

0.15    

180

2-3

Very fine crystalline

Very slow filtration

393 (purple dot)

100    

0.18    

300

1-2

Very fine crystalline

Very slow filtration