Gooch Crucibles and Porous Bottom.
The Gooch crucible is used for filtration and obeys the same standards as the melting crucible. The porous bottom crucible is made with porosity of 4 and 5 microns, used for vacuum filtration and for the analysis of tar or other derivatives. Calcined in mummies, usually between 800 and 1000 ° C, its filtration takes place between 1 and 2 minutes in dilution in 100 ml of water, at a pressure of 20 mm Hg (millimeters of mercury).
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