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Grade 40 Quantitative Filter Paper Ashless (Ash 0.007%), circle, 12.7 mm Grade 40 circles, ashless (0.007% ash), 12.7 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. The classic generalpurpose ashless filter paper with medium speed and retention. Typical applications include: gravimetric analysis for numerous components in cements, clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis; quantitative determination of sediments in milk; and as a pure analytical grade cleanup filter for solutions prior to atomic absorption (AA) spectrometry. Also used as a highpurity filter in the collection of trace elements and radionuclides from the atmosphere. Grade 40: 8 µm

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