whatman Grade50/52/54/540/541/542硬化無灰定量濾紙Quantitative Filter Papers - Hardened Low Ash Grades(Ash 0.015%)The maximum ash content of these grades is intermediate between ashless andqualitative grades. They are particularly suitable for Buchner filtrations whereit is desirable to recover the precipitate from the filter surface afterfiltration. Other characteristics include high wet strength and chemicalresistance which are similar to the acid hardened ashless filter papers.Grade 50: 2.7μmRetention of finest crystalline precipitates. The thinnest of all Whatman filterpapers. Slow flow rate. Hardened and highly glazed surface. This finish alsokeeps the paper free from loose surface fibres. Highly suitable for qualitativeor quantitative filtrations requiring vacuum assistance on Büchner or 3-piecefilter funnels. Very strong when wet. Will withstand wet handling andprecipitate removal by scraping. In the electronics industry, the virtualabsence of fibre shedding is utilised in carriers for integrated circuits.Grade52: 7μmThe general purpose hardened filter paper with medium retention and flow rate.Very hard surface. Grade 54: 20-25μmVery fast filtration for use with coarse and gelatinous precipitates. High wetstrength makes this grade very suitable for vacuum assisted fast filtration of"difficult" coarse or gelatinous precipitates. Grade 540: 8μmThe general purpose hardened ashless filter paper with medium retention and flowrate. Extremely pure and strong with a hard surface. High chemical resistance tostrong acid and alkali. Frequently used in the gravimetric analysis of metals inacid/alkali solutions and in collecting hydroxides after precipitation by strongalkalis. Grade 541: 20-25μmFast filtration of coarse particles and gelatinous precipitates in acid/alkalisolutions during gravimetric analysis. Typical applications include fibre inanimal foodstuffs, gelatine in milk and cream, chloride in cement, and chlorideand phosphorous in coal and coke. Grade 542: 2.7μmHigh retention of fine particles under demanding conditions. Slow flow rate.Very hard and strong with excellent chemical resistance. Often used ingravimetric metal determinations.Quantitative Filter Papers - Hardened Ashless Grades (Ash 0.006%)These are the supreme quantitative filter papers featuring high wet strength andchemical resistance. These papers are acid hardened, which reduces ash to anextremely low level. Their tough surfaces make them suitable for a wide range ofcritical analytical filtration operations. Each grade offers a convenientcombination of filtration speed and particle retention. Standard Circle Filter Funnel Volumes The maximum practical volume of the most popular disc sizes (quadrant folded) are: Diameter (mm)Volume (mL) 9015 11020 12535 15075 185135 240300
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