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Ahlstrom’s qualitative grades of filter paper are, by definition,
recommended for use in analytical methods, which determine or
identify particulate constituents of a mixture irrespective of the
amount present. Qualitative filter papers are often used in routine
separation work that still requires high purity and consistent
Ahlstrom offers a complete range of low ash filter papers for
general laboratory work that provides you with the correct
combination of particle retention, filtration speed, loading capacity
and wet-strength. All our qualitative grades consist of > 95%
super refined a-cellulose and linter fibers.
Standard Grades (Non Wet-Strengthened)
Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These
grades contain a high level of alpha-cellulose that provides high purity but will weaken when wet.
The inherent strength of standard (untreated) grades does not pose a problem when they are used in
routine quadrant folded applications. We do not recommend these grades for use in vacuum work or
when wet handling is required.
Ahlstrom 613: 6µm – Medium Speed
This is a strong filter paper with a medium flow rate
and retention. Ahlstrom 613 is commonly used in
student laboratories. This strong general-purpose
filter is also useful in Buchner funnels for barium
carbonate, lead chromate and beryllium hydroxides.
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