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Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high level of of alpha-cellulose that provides high purity but will weaken when wet. The inherent strength of standard (untreated) grades does not pose a a problem when they are used in routine quarant folded applications. We do not recommend these grades for use in vacuum work or when wet handling is required.
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MINIMUM ORDER IS REQUIRED, CONTACT US FOR AVAILABILITY
Qualitative wet-strengthened grades are manufactured for applications using filter paper in a system or aparatus that operates under pressure or vacuum conditions. These systems require the use of extremely strong filter paper such as those in Ahlstrom's Binder Series. These grades contain a small amount of chemically stable, insoluble binding resin that strengthens the natural fiber-to-fiber bonds under wet conditions. Grades containing wood fibers or resins containing nitrogen, are not recommended for use in quantitative ashing techniques and in Kjeldahl estimations. Ahlstrom's qualitative wet-strengthened filter papers are also used in industrial laboratories where technicians require a strong and economical filter paper with consistent quality and performance.
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