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Type of paper

A porous, unsized paper for filtering solid particles from liquids or gases. It is made from cotton fiber or chemical pulp or both. Important properties are uniformity of formation, moderate strength when wet, high retention of particulate matter, high filtering rate and usually, high chemical purity. For most purposes, the pore size is carefully controlled, since this determines, the speed of filtration and the size of particles removed from the fluid (liquid or gas). For analytical filter paper, the ash content should be as low as possible. Industrial filter papers are used on filter presses, automobile filters and machines in the chemical and allied industries for the removal of foreign particles or clarifying solutions. Those industrial filter papers are interchangeably known and used as blotting papers in that they are used because of .their absorptive quality rather than for their filtering quality.

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