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Grade 540 Quantitative Filter Paper Hardened Ashless, circle, 24 mm Grade 540 circles, hardened ashless. Hardened ashless: 0.006% ash maximum. These filters are acidhardened 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. These are the supreme quantitative filter papers featuring high wet strength and chemical resistance. These papers are acidhardened, which reduces ash to an extremely low level. The tough surfaces pf these fillters make them suitable for a wide range of critical analytical filtration operations. Each grade offers a convenient combination of filtration speed and particle retention. The general purpose hardened ashless filter paper with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali. Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis. Grade 540: 8 µm

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