Ahlstrom Qualitative Filter Papers, Grade 631

• Ahlstrom Grade 631: 10 m - Medium Speed (non wet-strengthened)
• This grade is used for the filtration of coarse particles and gelatinous precipitates such as ferric aluminum and magnesium hydroxides
• Ahlstrom 631 is used in air monitoring and gas filtration when high flow rate is needed
• This grade is also found in routine cleanup analysis of insoluble liquids such as biological fluids and organic elements

• 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 631 Properties:
• Retention: 10.0 µm
• Filtration speed (punch Herzberg): 34 sec./100 mL
• Filtration speed (Rapidity): 200 mL/min.
• Loading capacity: High

Image(s) are representative of the product group and not necessarily the individual product.
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• Ahlstrom Grade 631: 10 m - Medium Speed (non wet-strengthened)
• This grade is used for the filtration of coarse particles and gelatinous precipitates such as ferric aluminum and magnesium hydroxides
• Ahlstrom 631 is used in air monitoring and gas filtration when high flow rate is needed
• This grade is also found in routine cleanup analysis of insoluble liquids such as biological fluids and organic elements

• 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 631 Properties:
• Retention: 10.0 µm
• Filtration speed (punch Herzberg): 34 sec./100 mL
• Filtration speed (Rapidity): 200 mL/min.
• Loading capacity: High

Image(s) are representative of the product group and not necessarily the individual product.

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2023