Ahlstrom Qualitative Filter Papers, Grade 237

Ahlstrom Grade 237: 3 m - Medium Speed (non wet-strengthened). This high absorbency grade is twice as thick as grade 642 with similar particle retention. The superior absorbency offers excellent performance when used as a sample carrier. The extra thickness gives higher wet strength and loading capacity, enabling more precipitate to be held without clogging the filter. Ahlstrom 237 is also highly suitable for use in Buchner funnels and for dye filtration.

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 237 Properties:
• Retention: 3.0 µm
• Filtration speed (punch Herzberg): 114 sec./100 mL
• Filtration speed (Rapidity): 60 mL/min.
• Loading capacity: Medium
Image(s) are representative of the product group and not necessarily the individual product.

Circles
Filter Size (cm): 4.25

Circles
Filter Size (cm): 5.5

Circles
Filter Size (cm): 7

Circles
Filter Size (cm): 9

Circles
Filter Size (cm): 11

Circles
Filter Size (cm): 12.5

Circles
Filter Size (cm): 15