Filter funnel

A filter funnel is a laboratory funnel used for separating solids from liquids via the laboratory process of filtering.

In order to achieve this, a disk shaped piece of filter paper is usually folded in to a cone and placed within the funnel. The suspension of solid and liquid is then poured through the funnel, so as the solid particles are left on the filter paper whilst the liquid molecules pass through the paper to a vessel positioned below the funnel, producing a filtrate.

Filter funnels vary in size depending on the volume of suspension required to be filtered. They are usually constructed out of plastic except where the filtering of certain solvents requires the use of glass.