# Filter funnel

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{{short description|Laboratory funnel used for separating solids from liquids}}
{{more citations needed|date=January 2023}}{{wiktionary|filter funnel}}
A '''filter funnel''' is a [laboratory funnel](/source/laboratory_funnel) used for separating solids from liquids via the laboratory process of [filtering](/source/filter_(chemistry)).<ref>{{Cite web |title=Funnels {{!}} Fisher Scientific |url=https://www.fishersci.co.uk/gb/en/browse/90094202/funnels |access-date=2023-01-16 |website=www.fishersci.co.uk}}</ref>

In order to achieve this, a cone-like shaped piece of [filter paper](/source/filter_paper) is usually folded into a cone and placed within the funnel.  The [suspension](/source/Suspension_(chemistry)) of [solid](/source/solid) and [liquid](/source/liquid) is then poured through the funnel. The solid particles are too large to pass through the filter paper and are left on the paper, while the much smaller liquid [molecules](/source/molecules) pass through the paper to a vessel positioned below the funnel, producing a [filtrate](/source/filtrate).  The filter paper is used only once. The filtered liquid, the removed solid residue, or both may be of interest and kept.

If the filter paper has small pores, long-chained non polar liquids such as oil may clog it.

Cruder funnels than laboratory versions, made of [polyethylene](/source/polyethylene) or [galvanized](/source/Galvanization) steel and using a reusable [brass](/source/brass) or plastic mesh filter screen rather than paper, are typically used for [automotive](/source/Automobile) and similar [workshop](/source/workshop) use, for example to filter debris from fuel, lubricating oil and coolant.  The screen is reusable, and may be cleaned by inverting the funnel and tapping it on a hard surface, or popping it out and washing it separately. Use of a funnel helps to avoid liquid spills.
{{Laboratory equipment}}

==References==
{{Reflist}}

{{DEFAULTSORT:Filter Funnel}}
Category:Laboratory equipment
Category:Water filters

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Adapted from the Wikipedia article [Filter funnel](https://en.wikipedia.org/wiki/Filter_funnel) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Filter_funnel?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.