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General description Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs. Ashless: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades – very pure filters suitable for a wide range of critical analytical filtration procedures. Hardened low ash: 0.015% ash maximum – treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates. Hardened ashless: 0.006% ash maximum – acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures. Grade 44: 3 μm (slow to medium filter paper) Thin version of Grade 42 retaining very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42. Other Notes Field of Use : For internal research use only. Products are not intended for diagnostic use or resale. Legal Information Whatman is a registered trademark of GE Healthcare Related Categories Filtration Supplies, Labware, Paper Filters, Quantitative material circles cotton filters (high-quality cotton linters) packaging pack of 100 mfr. no. Whatman Article No., 28418065 (US reference) Whatman, 1444-110 limit 0.29 psi wet burst 995 sec/100 mL speed (Herzberg) diam. 110 mm thickness 180 μm ash ≤0.007% pore size 3 μm (Particle retention) basis weight 80 g/m2