Ahlstrom Hardened Ashless Quantitative Filter Papers (Ash 0.006%), Grade 55

Grade 55: 15 µm - Fast Speed. This is a fast filtering grade for gravimetric analysis of coarse particles and gelatinous precipitates (i.e.: aluminum and zirconium hydroxides) in acid and alkali solutions. This grade is also used in air and foodstuff analysis and for chloride and phosphorous in cement, coal, and coke.

Hardened Ashless Grades (Ash 0.006%). These specially treated hardened ashless grades are available for critical quantitative analytical techniques requiring increased wet-strengthed and handling capacity. These high purity filter papers have a tough, smooth surface free of loose fibers and are ideal for collecting wet precipitates. Each grade offers a convenient combination of particle retention and flow rate and are generally used because of their high chemical resistance to strong acid and alkali.

• Qualitative analysis
• Low ash content 0.07% (acid-wash treated)
• High-wet-strength
• Consistent performance
• Custom cut
• Bulk packaging

Grade 55 Properties:
• Retention: 15.0 µm
• Filtration speed (punch Herzberg): 31 sec./100 mL
• Filtration speed (Rapidity): 220 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): 2.1

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Filter Size (cm): 2.4

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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

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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): 24

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Filter Size (cm): 27

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Filter Size (cm): 32

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Filter Size (cm): 40