Micro photo of a coffee filter. The cellulose fibers are clearly visible. The pore size of the uncoated paper is about 5 microns.
Filtering paper is semipermeable paper, which is used in chemistry and daily life with, for example, coffee, coffee filter.
The filter paper is available with different properties. The choice depends on the desired paper strength, particle size, efficiency, and flow rate to be filtered. In addition, the filter paper should not be affected by filtration. If after filtering the solids filter must be burned to determine the ash content, the filter should not leave ash as in the gravimetric analysis.
In the chemistry, the filter paper is placed in a glass or plastic funnel or Büchner filter. Also see
wiki
