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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 610: 1.5µm – Slow Speed
This grade is a slow flowing filter designed to retain
fine particles encountered in qualitative analysis.
Ahlstrom 610 is widely used for water analysis,
biological products and fine precipitates such as coldprecipitated
barium sulfate. Ahlstrom 610 is also
used in Buchner funnels and to clarify cloudy
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