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Grade 589/1 ˝ Quantitative Filter Paper Ashless (Ash 0.01%), folded, 150 mm 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. ''Black Ribbon Filter'': The established standard in quantitative analysis for the filtration of coarse precipitates (class 2a acc. to DIN 53 135). Ashless filter paper with very high flow rate. Used for many quantitative standard methods, especially for gravimetric applications (e.g., determination of the ash content in foodstuffs, or for the Blaine test in the cement industry). Also available prepleated as Grade 589/1 ˝. Grade 589/1: 12–25 µm

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