Qualitative Filter Paper, Low Ash

Photo of Ahlstrom 613 Medium Flow Qualitative Filter Paper

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 Büchner funnels for barium carbonate, lead chromate and beryllium hydroxides. Ahlstrom

Photo of Ahlstrom 610 Slow Flow Qualitative Filter Paper

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 cold-precipitated barium sulfate. Ahlstrom 610 is also used in Buchner funnels and to clarify cloudy suspensions. Ahlstrom

Photo of Ahlstrom 601 General Purpose Filter Paper

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 cold-precipitated barium sulfate. Ahlstrom 610 is also used in Büchner funnels and to clarify cloudy suspensions. Ahlstrom

Photo of Ahlstrom 642 Qualitative Fast Flow Filter Paper

This grade has finer particle retention than Ahlstrom 601 but with slightly lower filtration speed. Ahlstrom 642 also has higher absorption than Ahlstrom 601. It is used in general laboratory applications to retain particles above 2 mm in size. Ahlstrom 642 is also found in agricultural and environmental laboratories for plant growth trials, soil testing, and air analysis for monitoring specific contaminants and in the filtration of organic and sulfide precipitates. Ahlstrom

Photo of Ahlstrom 542 Medium Flow Rate Pre-Pleated Filter Paper
Ahlstrom's pre-pleated grades can save valuable time and maximize the efficiency of the laboratory filter system. Pleating improves the effective surface area increasing flow rate and loading capacity thus decreasing filtration time. Pleated circles are available in 12.5cm to 50cm diameters. Grade 542 has a medium flow rate filtering speed with 2 µ particle retention.
Photo of Ahlstrom 513 Medium Speed Qualitative Pre-Pleated Filter Paper

Ahlstrom's pre-pleated grades can save valuable time and maximize the efficiency of the laboratory filter system. Pleating improves the effective surface area increasing flow rate and loading capacity thus decreasing filtration time. Pleated circles are available in 12.5cm to 50cm diameters. Grade 513 has a medium rate filtering speed with particle retention of 6 µm.