There are many different types of filter paper. The type that best meets the analytical needs should be used.
If the paper needs to be ashed (for gravimetric analysis), then a quantitative paper should be used.
Parameters affecting selection of a qualitative paper:
(1) wet strength
(2) pleating
(3) type of precipitate
Wet Strength |
Pleating |
Precipitate |
Whatman Type |
high |
yes |
NA |
113V or 114V |
high |
no |
NA |
91 or 113 |
low |
yes |
NA |
2V |
low |
no |
fine |
5 or 6 |
low |
no |
coarse or gelatinous |
4 |
low |
no |
other |
1 or 2 or 3 |
Specialty: Clinical Laboratory