Whatman cellulose filters are manufactured from high quality cotton linters which have been treated to achieve a minimum alpha cellulose content of 98%. These cellulose filter papers are used for general filtration and exhibit particle retention levels down to 2.5 µm. Whatman offers a wide choice of retention and flow rate combinations to suit numerous laboratory applications.
The different groups of cellulose filters offer increasing degrees of purity, hardness, and chemical resistance.
| Cellulose Filter Selection - Trace Elements: typical values (ug/g of paper)
|
| Grade |
1 |
42 |
542 |
Grade |
1 |
42 |
542 |
| Aluminum |
< 0.5 |
2 |
1 |
Iron |
5 |
6 |
3 |
| Antimony |
< 0.02 |
< 0.02 |
< 0.02 |
Lead |
0.3 |
0.2 |
0.1 |
| Arsenic |
< 0.02 |
< 0.02 |
< 0.02 |
Magnesium |
7 |
1.8 |
0.7 |
| Barium |
< 1 |
< 1 |
< 1 |
Manganese |
0.06 |
0.05 |
0.05 |
| Boron |
1 |
1 |
2 |
Mercury |
< 0.005 |
< 0.005 |
< 0.005 |
| Bromine |
1 |
1 |
1 |
Nitrogen |
23 |
12 |
260 |
| Calcium |
185 |
13 |
8 |
Potassium |
3 |
1.5 |
0.6 |
| Chlorine |
130 |
80 |
55 |
Silicon |
20 |
< 2 |
< 2 |
| Chromium |
0.3 |
0.3 |
0.7 |
Sodium |
160 |
33 |
8 |
| Copper |
1.2 |
0.3 |
0.2 |
Sulfur |
15 |
< 5 |
< 2 |
| Fluorine |
0.1 |
0.2 |
0.3 |
Zinc |
2.4 |
0.6 |
0.3 |