Filter paper is a kind of paper which has good filtering quality. It is loose and has a strong liquid absorbing performance. Assay laboratory often uses filter paper as the filtration medium to separate the solid from the solution.
In the current market, the filter papers are mainly divided into qualitative filter paper, quantitative filter paper, and chromatography qualitative filter paper. The former two kinds are basically made of cellulose, and they are not suitable for other filter papers such as glass microfiber filter paper.
In common, the qualitative filter paper is used for qualitative chemical analysis and relevant filtering separation. Specifically, solution filtration and qualitative tests of chloride and sulfate which do not need the calculated values.
On the other side, the quantitative filter paper is used for filtration with precisely calculated values, such as determination of residual value and undissolved substance.
Generally, after filtering with quantitative filter paper, the filter needs to be processed in the high-temperature furnace. Moreover, during the manufacturing process of quantitative filter paper, the paper pulp is processed with hydrochloric acid and hydrofluoric acid and washed by distilled water. So, most of the impurities in the paper fibers will be removed, and the residual ash remains very few after firing.
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