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Disposable (single-use) papers appropriate for removing particles (i.e., filtration), typically from liquids and gels. General-purpose cellulose fiber filter papers are used mainly for clarifying and removing particles in gravity and/or low-suction procedures; they can usually retain particles of micron or larger. Papers intended for filtration are typically available in a variety of shapes and sizes (e.g., rectangle, square, circle, fluted circle for use in a conical funnel); they are frequently classified as fine (1 to 3 microns), medium (3 to 10 microns), or coarse (more than 20 microns) according to the particle size they can retain. Filter papers are used in a variety of procedures performed in clinical laboratories; dedicated filter papers are available for use in vacuum filtration systems and for low-ash or ashless paper filtration.
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