Laboratory funnel

Laboratory funnels are made for chemical laboratory use. Many different kinds of funnel have been designed for specialized applications. Filter funnels, thistle funnels (shaped like thistle flowers), and dropping funnels have stopcocks which allow the fluids to be added to a flask slowly. For solids, a powder funnel with a short and wide neck/stem is more appropriate as it prevents clogging.

When used with filter paper, filter funnels, Buchner and Hirsch funnels can be used to separate solid particles from a liquid by filtration. To separate very small particles the filter paper in the latter two may be replaced with a sintered glass frit.

Separatory funnels are used in liquid-liquid extractions.

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