- Filtering funnels for use with vacuum filtration or gravity-based separations.
- Measure precisely using the KIMBLE® ULTRA-WARE® glass funnel with graduated markings on its surface.
- Choose KIMBLE® KONTES® Büchner funnel for applications that require low pressures.
- Achieve efficient filtering with the DURAN® Büchner filter funnel with a sintered disc, available in various funnel sizes and sinter porosities.
- Choose KIMBLE® KONTES® fritted Hirsch funnels for applications that require fine particle filtration, residue analysis, and small sample volumes.
Frequently Asked Questions
A filter funnel, also called a filtering funnel, is a laboratory apparatus used for separating solids from liquids. Depending on the substance being filtered, either gravity or vacuum filtration techniques can be used.
A filtering funnel has a unique shape and design to facilitate the efficient and controlled transfer of liquids. It is typically cone-shaped or cylindrical with a wide opening at the top, which tapers to a narrow stem with a small opening at the bottom. Here are the ways a filter funnel works:
- Channels and directs the liquid being poured into it. The wide opening at the top temporarily holds the liquid, and the funnel design allows the liquid to direct flow through the funnel and into the receiving container.
- Prevents spills and splashes, ensuring the liquid flows smoothly into the receiving container.
- Controls the flow rate as the narrow stem at the bottom of the funnel helps to regulate the flow rate of the substance.
The difference between filter paper and a filter funnel lies in their respective functions and components. Filter paper is a porous material (available in various pore sizes and types) placed inside a filter funnel to act as the filtration medium that traps solid particles while allowing liquid to pass through. A filter funnel aids filtration, providing a pouring channel and directing the liquid flow. A filter funnel can hold the filter paper if the experiment requires its use. However, not all filter funnels require the use of filter paper.
The difference between a filter funnel and a separating funnel is its uses. A filter funnel is used for solid-liquid separation and filtration, while a separating funnel is used to separate immiscible liquids, i.e., liquids with different densities.
Cleaning a filter funnel may vary slightly depending on its material and design. Here are some guidelines you can use to clean a filter funnel:
- Dispose of the filtered solid material into an appropriate waste container.
- Rinse the filter funnel inside and outside with water to remove any remaining residue.
- Wash the filter funnel with a mild cleaning solution. Thoroughly rinse it with water to remove the cleaning solution.
- Dry the funnel entirely before storing or reusing it.