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Grade 42 Quantitative Filter Paper Ashless (Ash 0.007%), circle, 125 mm Grade 42 circles, ashless (0.007% ash), 125 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. A world standard for critical gravimetric analysis with the finest particle retention of all Whatman cellulose filter papers from GE Healthcare. Typical analytical precipitates include barium sulfate, metastannic acid, and finely precipitated calcium carbonate. Grade 42: 2.5 µm

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