To produce quantitative papers, the high-quality raw materials (cotton linters with 98 % of alpha-cellulose content) are treated to reduce mineral content and therefore get an ignition residue of 0.01 %.
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Qualitative papers are also made of high-quality raw materials (refined pulp & linters with 95 % of alpha-cellulose content) but without any reduction of mineral content. Their ignition residue is 0.1 %.
Quantitative and qualitative papers are mostly used in analytics due to their quality.
Qualitative and technical papers can be used in analytics for pre-filtration steps but predominantly cover technical filtration.
No, there is no relation between the weight of a paper and its filtration capacities. You can define filtration parameters of a paper over the thickness and length of the fibers (grinding time of the raw material). A 100 g/m² paper can get the same filtration rate than a 65 g/m² paper.
Filter papers are depth filters made of fibers with an irregular structure. Their depth structure allows retention of different particle sizes not only on the surface of the filter but also in its structure. A filter paper can only be defined by the capacity to retain a certain particle size. As there is no standard of how to define particle retention of a depth filter, the comparison between filters is valid only with filters tested with the same test method.
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Qualitative filter paper is used for qualitative analysis, which is the process of identifying the components of a mixture. It is not used for quantitative analysis, which is the process of measuring the amount of each component in a mixture. Qualitative filter paper is typically made from cellulose and has a variety of pore sizes. The pore size determines the size of the particles that can be filtered out of a solution. Qualitative filter paper is used in a variety of applications, such as filtering precipitates from solutions, clarifying liquids, and removing particles from gases.
Quantitative filter paper is used for quantitative analysis. It is typically made from cellulose that has been treated to remove any impurities. This makes it possible to use the filter paper to measure the amount of each component in a mixture. Quantitative filter paper is available in a variety of pore sizes. The pore size determines the size of the particles that can be filtered out of a solution. Quantitative filter paper is used in a variety of applications, such as gravimetric analysis, which is a type of quantitative analysis that is used to measure the mass of a substance.
Cellulose chromatography paper is used for paper chromatography, which is a technique used to separate the components of a mixture. It is typically made from cellulose and has a specific pore size and thickness. The pore size and thickness of the paper are important because they affect the way that the components of the mixture separate. Cellulose chromatography paper is used in a variety of applications, such as separating amino acids, sugars, and dyes.
Pre-folded qualitative filter paper is qualitative filter paper that has been pre-folded into a cone shape. This makes it easier to use the filter paper in a funnel. Pre-folded qualitative filter paper is available in a variety of pore sizes. The pore size determines the size of the particles that can be filtered out of a solution. Pre-folded qualitative filter paper is used in a variety of applications, such as filtering precipitates from solutions, clarifying liquids, and removing particles from gases.
Glass microfiber filter paper is made from glass fibers. It has a very small pore size, which makes it possible to filter out very small particles. Glass microfiber filter paper is used in a variety of applications, such as filtering bacteria from liquids and removing particles from gases. It is also used in air pollution monitoring.
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