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Grade 43 Quantitative Filter Paper Ashless (Ash 0.007%), circle, 90 mm Ashless: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades. These are very pure filters suitable for a wide range of critical analytical filtration procedures. Whatman quantitative filters from GE Healthcare are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet specific needs. Intermediate in retention between Grades 40 and 41, and twice as fast as Grade 40. Typical applications include: foodstuffs analysis; soil analysis; particle collection in air pollution monitoring for subsequent analysis by XRay fluorescence (XRF) techniques; and inorganic analysis in the construction, mining, and steel industries. Grade 43: 16 µm

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