Ahlstrom Qualitative Filter Papers, Grade 642

Ahlstrom Grade 642: 2 m - Medium Speed (non wet-strengthened). 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 m 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.

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 642 Properties:
• Retention: 2.0 µm
• Filtration speed (punch Herzberg): 229 sec./100 mL
• Filtration speed (Rapidity): 30 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): 9

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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