Ahlstrom Qualitative Filter Papers, Grade 609

Ahlstrom Grade 609: 4 m - Medium Speed (non wet-strengthened). 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.

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. Ahlstrom does not recommend these grades for use in vacuum work or when wet handling is required.

• Qualitative analysis
• Low ash content 0.06%
• > 95% super refined -cellulose and linter fibers
• Untreated
• Consistent performance
• Custom cut
• Bulk packaging

Grade 609 Properties:
• Retention: 4.0 µm
• Filtration speed (punch Herzberg): 98 sec./100 mL
• Filtration speed (Rapidity): 70 mL/min.
• Loading capacity: Medium
Image(s) are representative of the product group and not necessarily the individual product.

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Filter Size (cm): 4.25

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Filter Size (cm): 5.5

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Filter Size (cm): 7.5

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Filter Size (cm): 7

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Filter Size (cm): 11

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Filter Size (cm): 12.5

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Filter Size (cm): 15

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Filter Size (cm): 18.5

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Filter Size (cm): 20.5

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Filter Size (cm): 24

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Filter Size (cm): 25

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Filter Size (cm): 27

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Filter Size (cm): 32

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Filter Size (cm): 33

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Filter Size (cm): 38.5

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Filter Size (cm): 40

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Filter Size (cm): 45

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Filter Size (cm): 50