A glass Buchner funnel.
Here are its main features:
Material: Made of borosilicate glass, offering high chemical and thermal resistance.
Filter disc: Incorporates a sintered glass disc (or “frit”) instead of a filter paper holder, making it useful when conventional filter papers are attacked by reagents (acids or alkalis).
Vacuum connection: Has a side tube with a connection for a vacuum source (often a water pump) to speed filtration.
Ground joint: Equipped with a ground glass cone, allowing a tight connection to other laboratory glassware such as a vacuum flask.
Use: Mainly used for vacuum filtration in the laboratory, particularly for the separation of solids and liquids.
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