Filtering
The filtering aims to separate a liquid from a solid material in the liquid by means of dissolving liquids on the filter material, e.g. filter paper. Filter materials consist of various types, namely:
- Filter paper
- Gooch Crucibles
- Fiber glass
- Crucibles of sintered glass
- The porous porcelain crucibles
- The filter material has a size of porosity.
There are two kinds of ways of filtering, i.e.:
- Suctioning without filtration (gravity filter), the filter passes the filtrate due to the influence of the force of gravity and capillary attraction between the liquid wall stalks with a funnel.
- Filtering by suctioning (vacuum viltration), this way there will be a pressure difference between the filters so that filtering is becoming faster.
Which way will be used depending on the desired accuracy (is it filtered sediment must be accommodated and there is everything that is missing), the time needed for filtering and the nature of sediment are filtered out. Filtering tampa suctioning using filter paper and funnel cone-shaped glasses. This way a slow but very good especially in the analysis are gravimetris when compared with screening use suctioning, due to the possibility of the loss of sediment is small. Also the ingredients are gelatin better filtered in this way because when the filtering is done by suctioning, sediment will immediately close the pores of the filter so as to tersumpat. Filtering by suctioning is suitable primarily for large deposits in the form of crystals (crystaline).
The filter paper is used there are several types of them ordinary filter paper, ash-free filter paper and others. Each type of filter paper were made in various sizes as well as the level of porositasnya.
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