Filtering Funnels
Filtering Funnels
Filtering funnels, also known as Buchner and Hirsch funnels, include a cylinder separated from the funnel with a fritted glass disc or perforated plate. Fritted glass disc funnels are immediately ready for use, while perforated plates call for filter paper moistened with liquid to prevent initial leakage.
Vacuum suction then draws the liquid through the filter and into the cylinder. Porcelain filtering funnels are resistant to acids and alkalis, except for hydrofluoric acid, but should not be used in the filtration of extremely corrosive reagents, which can slowly corrode their protective enamel. The funnels are glazed both outside and inside, except the rim, and are autoclavable.
What Is a Buchner Funnel Used for?
Buchner funnels are used in the laboratory for vacuum-assisted liquid filtering. In organic chemistry, these funnels are used to collect recrystallized compounds because they help remove moisture from the final product.
How Does a Buchner Funnel Work?
Buchner funnels consist of an open straight-sided cylindrical chamber that narrows to a tube- or pipe-shaped opening. The tube-like extension can be placed through a stopper, which is then placed into the top of a filtration or Buchner flask. Plastic versions may have a bung hole located at the side of the chamber to which a vacuum may be attached. Buchner funnels are reusable.
What Types of Buchner Funnels Are There?
The bottom of the Buchner funnel chamber may be perforated or contain a separate fritted disc. Filter paper is used for Buchner funnels with perforated lower surfaces. Place the filter paper of the preferred porosity inside the chamber, pre-wet, add the liquid, and apply the vacuum.
Filtration with a Buchner funnel proceeds more quickly than letting the liquid flow simply using gravity. Most Buchner funnels are also rated for a maximum vacuum pressure.
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Filtered Search Results
Synthware™ Buchner Funnels with Inner Joint and Perforated Glass Plate
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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With sealed in perforated glass disc to support filter media
Product Type | Buchner Funnels with Inner Joint and Perforated Glass Plate |
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Color | Clear |
Material | Borosilicate Glass 3.3 |
Fisherbrand™ Porcelain Buchner Funnels with Fixed Perforated Plates
For suction filtration applications
Includes | Fixed perforated plate |
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Product Type | Buchner Funnel |
Quantity | Each |
Material | Porcelain |
For Use With (Application) | Suction filtration applications |
Autoclavable | Yes |
DWK Life Sciences Kimble™ Kontes™ Buchner Filter Funnels
Two side hose connection
Includes | Sealed-in fritted disc, drip tip and integral No. 2 side hose connection |
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Product Type | Buchner Funnel |
Material | Borosilicate Glass |
Certifications/Compliance | USP Type I, ASTM E438 Type I, Class A |
Synthware™ Buchner Funnels with Inner Joint
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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For use with filtration techniques.
Product Type | Buchner Funnel |
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PYREX™ Buchner Funnels with Fine Porosity Fritted Disc
Useful where filter paper would be attacked by material being filtered
Corning™ PYREX™ Buchner Funnels with Fine Porosity Fritted Disc
Useful where filter paper would be attacked by material being filtered
Includes | Fritted discs |
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Product Type | Buchner Funnel |
Material | Pyrex Glass |
Certifications/Compliance | ASTM E128 |
For Use With (Application) | Useful where filter paper would be attacked by material being filtered |
Bel-Art™ SP Scienceware™ Buchner Funnels
Easy-to-clean two-piece, polypropylene with perforated HDPE plastic filter plate
Bel-Art™ SP Scienceware™ Single-Piece Buchner Funnels
One-piece HDPE with sealed-in, polyethylene Fritware™ porous filter plate
Pore Size | 90 to 130μ |
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Description | Fritware™ polyethylene filter |
Max. Temperature (English) | 125°F |
Material | HDPE |
Porosity | Coarse |
Max. Temperature (Metric) | 52°C |
Thermo Scientific™ Nalgene™ Büchner Two-Piece Polypropylene Funnels
Separate the lightweight and durable two-piece polypropylene funnels for easy cleaning. These funnels won't chip, crack or break.
Material | Polypropylene |
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Autoclavable | Yes |
Synthware™ Buchner Funnels with Perforated Glass Plate
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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With sealed in perforated glass disc to support filter media
Product Type | Buchner Funnel with Perforated Glass Plate |
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Color | Clear |
Material | Borosilicate Glass 3.3 |
DWK Life Sciences Kimble™ Kontes™ Buchner Funnel with Sealed-In Fritted Disc
Useful with paper or polymeric filters
Includes | Sealed-in fritted disc, drip tip and integral No. 2 side hose connection |
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Height (Metric) | 160 mm |
Diameter (Metric) Disc | 40mm |
Diameter (Metric)Top | 60mm |
Product Type | Buchner Funnel |
Capacity (Metric) | 60 mL |
Joint Number | 24/40 |
Material | Borosilicate Glass |
Certifications/Compliance | USP Type I, ASTM E438 Type I, Class A |
Bel-Art™ SP Scienceware™ Two-Piece Buchner Funnel
Light weight and durable funnel for use in filtration
Bel-Art™ SP Scienceware™ Table-Top Buchner Funnels, 36 in. (91.4cm) I.D.
Filter large volumes quickly with a polyethylene plastic Table-Top Buchner Funnel.
Height (Metric) | 37.5 cm |
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Diameter (Metric)Top | 91.4cm |
Material | Polyethylene |
Synthware™ Buchner Filter Funnels
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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Offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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Used to filter particulates from a variety of substances
Product Type | Buchner filter funnel |
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United Scientific™ Polypropylene Buchner Funnels
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
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Science Education
A science education product.
Small and/or diverse supplier based on Federal laws and SBA requirements.
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A science education product.
Funnels offer high quality and value.
Product Type | Funnel |
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Color | White |
Material | Polypropylene |