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
no
91 or 113
low
2V
fine
5 or 6
coarse or gelatinous
4
other
1 or 2 or 3
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Specialty: Clinical Laboratory
