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
Fisherbrand™ Glass Funnel Filter with Sintered Glass Disc
Constructed of borosilicate glass and available in a variety of capacities. Fisherbrand™ Glass Funnel Filters with Sintered Glass Disc filter medium precipitates ranging from 16 - 40μm and 10 to 14μm pore sizes respectively.
Includes | Sintered glass disc |
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Product Type | Filter Funnel |
Material | Borosilicate Glass |
Haldenwanger™ Porcelain Buchner Funnel
Use these funnels for a variety of filtration applications. Haldenwanger™ Porcelain Buchner Funnels are constructed from optimized laboratory porcelain.
Product Type | Buchner Funnel |
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Quantity | 1Each |
Material | Porcelain |
Haldenwanger™ Porcelain Buchner Funnel
Designed with glazed porcelain for excellent thermal and chemical resistance. Haldenwanger™ Porcelain Buchner Funnels are an excellent choice for quick filtration.
Product Type | Buchner Funnel |
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Quantity | 1Pack |
Material | Porcelain |
Pyrex™ Short Stem Glass Funnel
Manufactured from chemical and heat resistant Pyrex™ Borosilicate Glass. Pyrex™ Short Stem Glass Funnel with 60° bowl angle provides precise fitting of filter paper.
Product Type | Short stem funnel |
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Certifications/Compliance | NF B 35 032 |
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 | Autoclavable |
Haldenwanger™ Porcelain Hirsch Funnel
Designed with glazed porcelain for excellent thermal and chemical resistance. Haldenwanger™ Porcelain Hirsch Funnels are an excellent choice for quick filtration.
Product Type | Hirsch Funnel |
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Quantity | 1Pack |
Material | Porcelain |
DWK Life Sciences DURAN™ Filter Funnel
Filter funnels are filters that are used for solid-liquid separation by means of vacuum.
Quantity | 1 Ea. |
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Material | Borosilicate Glass (3.3) |
For Use With (Application) | Qualitative inorganic analysis and preparative chemistry; Fine filtration; Fine filtration; Filtration at reduced pressure; Filtering |
Autoclavable | Autoclavable |
Thermo Scientific™ Nalgene™ Büchner Two-Piece Polypropylene Funnels
Greener Choice Product
This product offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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This product offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
Learn More About the Greener Choice Program
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 | Autoclavable |
Includes | Molded in perforated PP filter plate |
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Product Type | Buchner Funnel |
Material | Polypropylene |
Autoclavable | Autoclavable |
Quickfit™ Glass Büchner Funnel with Glass Sintered Disc
Used in place of conventional filter papers that would be destroyed by acids and alkalis. Quickfit™ Glass Büchner Funnel with Sintered Glass Disc is manufactured from chemical-resistant borosilicate glass. Integral ground glass cone on stem connects to Quickfit™ Büchner flasks and vessels.
Pore Size | 16 to 40μm |
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Includes | Sintered glass disc, ground glass cone |
Material | Borosilicate Glass |
Porosity | 3 |
For Use With (Application) | Bases or acids that can destroy conventional filter papers |
Rogo-Sampaic Porcelain Buchner Funnels
Excellent for separating liquids from solids in the laboratory. Porcelain Buchner Funnels provide a quick and easy pressure assisted filtration method.
Product Type | Buchner Funnel |
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Quantity | 1Each |
Material | Porcelain |
Includes | With fixed filter plate |
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Product Type | Hirsch Funnel |
Quantity | 1Each |
Material | Porcelain |
Kartell™ Polypropylene Buchner Funnels
SureTRACE
Supporting your traceability needs through proactive availability of certificates and change notifications.
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Supporting your traceability needs through proactive availability of certificates and change notifications.
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Manufactured from robust, lightweight polypropylene for durability and excellent chemical resistance. Kartell™ Polypropylene Buchner Funnels with an integral filter is ideal for separating solids from liquids in a laboratory.
Description | Buchner filter |
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Material | Polypropylene |
For Use With (Application) | Filtration, separating solids from liquids, collecting recrystallized compounds |
Autoclavable | Autoclavable |
Haldenwanger™ Porcelain Buchner Funnel
An excellent and durable choice for the handling of materials in the laboratory.
Description | Polypropylene filter |
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Quantity | 1/Pk. |
Material | Polypropylene |
Autoclavable | Autoclavable |