Ahlstrom 6090-0425 Qualitative Filter Paper, 4.25cm Diameter, 4 Micron, Medium Flow, Grade 609 (Pack of 9)

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. 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. Qualitative analysis, low ash content 0.06 percent, untreated, consistent performance, wet-strengthened grades, custom cut. 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.

• Qualitative filter papers are often used in routine separation work that still requires high purity and consistent performance
• Qualitative grades consist of greater than 95 percent super refined a-cellulose and linter fibers
• Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications
• This grade is an evolution of ahlstrom 613 for use in the beer industry
• This is a filter paper with an extremely low iron and nitrogen content for the analysis of protein in beer