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
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 |
BrandTech™ Polypropylene Funnels
BrandTech polypropylene funnels with its steep 60° angle, encourages swift and rapid transfers.
Angle | 60° |
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Product Type | Filtering Funnel |
Max. Temperature (English) | 257°F |
Color | Clear |
Graduated | Yes |
Material | Polypropylene |
Max. Temperature (Metric) | 125°C |
For Use With (Application) | Variety of laboratory applications |
Autoclavable | Autoclavable |
Robu™ Büchner Filter Funnels with Porosity 4 VitraPOR™ Glass Filter Discs
Robu™ Büchner Filter Funnels with Glass Filter Discs are made of pure borosilicate 3.3 glass and are highly resistant to most chemicals, including solvents, acids, and alkalis. The VitraPOR™ filter disc is rated as Porosity 5 (Pore size: 1 to 1.6 μm, Standard: ISO 4793-80).
Pore Size | 10 to 16 μm |
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Product Type | Buchner Funnel |
For Use With (Equipment) | Guko Rubber Gaskets (e.g. 10430652) |
Material | Borosilicate Glass |
Porosity | 4 μm |
Certifications/Compliance | ISO 4793-80 |
For Use With (Application) | Filtration |
Includes | With fixed filter plate |
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Product Type | Hirsch Funnel |
Quantity | 1Each |
Material | Porcelain |
Robu™ Büchner Filter Funnels with Porosity 3 VitraPOR™ Glass Filter Discs
Robu™ Büchner Filter Funnels with Glass Filter Discs are made of pure borosilicate 3.3 glass and are highly resistant to most chemicals, including solvents, acids, and alkalis. The VitraPOR™ filter disc is rated as Porosity 3 (Pore size: 16 to 40 μm, Standard: ISO 4793-80).
Pore Size | 16 to 40 μm |
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Product Type | Buchner Funnel |
For Use With (Equipment) | Guko Rubber Gaskets (e.g. 10430652) |
Material | Borosilicate Glass |
Porosity | Grade 3 |
Certifications/Compliance | ISO 4793-80 |
For Use With (Application) | Filtration |
Thermo Scientific™ Nalgene™ Single Use Analytical Filter Funnels
Greener Choice Product
This product offers one or more environmental benefits itemized in the U.S. FTC Green Guides.
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SureTRACE
Supports traceability with guaranteed access to certificates and proactive change notifications.
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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
Supports traceability with guaranteed access to certificates and proactive change notifications.
Learn More
Perform microbiological QC testing and analysis of water, food/beverage, raw material and finished product with these economical sterile disposable funnels.
For Use With (Equipment) | Filter Manifold, Filtering Flask |
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Material (Membrane) | Cellulose Nitrate |
Diameter (Metric) Filter | 47 mm |
Merck Glass Funnel for Vacuum Filtration
Designed to replace parts contained in glass vacuum filtration kits or provide for an alternative configuration
Diameter (Metric)Top | 47 mm |
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Color | Clear |
Thermo Scientific™ Nalgene™ Reusable Filter Funnel with Clamp
Designed for use in a wide range of applications, Thermo Scientific™ Nalgene™ filtration hardware and accessories can be used in conjunction with our various lines of filtration devices.
Saint Gobain Life Sciences Chemware™ PFA Funnel
Chemware™ PFA Funnel is used for ultra-pure liquid transfer in biotechnology applications, environmental analysis, semiconductor and electronic labs.
Sartorius™ Glass Funnels
Use with glass vacuum filter holder assemblies. Sartorius™ Glass Funnels are made of high-quality borosilicate glass. Available in 30, 250 and 400mL capacities.
Product Type | Glass Funnel |
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Material | Borosilicate Glass |
For Use With (Application) | Filtration with glass vacuum filter holder assemblies |
Pyrex™ Conical Glass Funnel with PTFE Key
Manufactured from chemically resistant Pyrex™ borosilicate glass. Pyrex™ Conical Glass Funnel with interchangeable PTFE stopcock. Complies with ISO 4800 Type 1 Standards.
Product Type | Separating funnel |
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Material | Borosilicate Glass,Borosilicate Glass |
Certifications/Compliance | ISO 4800 |
Pyrex™ 60mm Diameter Glass Büchner Filter Funnel
Manufactured from chemically resistant Pyrex™ borosilicate glass. Pyrex™ 60mm Glass Büchner Filter Funnnel includes an integral sintered glass disc also constructed with Pyrex™ glass. High resistance to most corrosive agents, and does not require filter papers.
Includes | Integrated filter plate sintered Glass disc |
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Height (Metric) | 180 mm |
Diameter (Metric) Disc | 60mm |
Length (Metric) Stem | 100mm |
Capacity (Metric) | 125 mL |
Material | Borosilicate Glass,Borosilicate Glass |
For Use With (Application) | For convenient filtration of solutions |
Diameter (Metric) Stem | 13mm |
Pyrex™175mm Diameter Glass Büchner Filter Funnel
Manufactured from chemically resistant Pyrex™ glass. Pyrex™ 175mm Diameter Glass Büchner Filter Funnel with integral sintered glass disc is highly resistant to most corrosive reagents and eliminates the need for filter papers.
Includes | Integrated filter plate sintered Glass disc |
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Height (Metric) | 390 mm |
Diameter (Metric) Disc | 175mm |
Length (Metric) Stem | 150mm |
Capacity (Metric) | 4000 mL |
Material | Borosilicate Glass,Borosilicate Glass |
Diameter (Metric) Stem | 30mm |
DWK Life Sciences DURAN™ Filter Crucible
Filter crucibles are filters that are used like filter chutes in solid-liquid separation by means of vacuum. They are particularly suitable for precipitation, which must be dried to a constant weight.
Quantity | 10/Pk. |
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Material | Borosilicate Glass (3.3) |
For Use With (Application) | Qualitative inorganic analysis and preparative chemistry; Separation and further processing of the filter residue; Separation and further processing of the filter residue; Filtration at reduced pressure; Filtering; Matching rubber sleeve and filter feed available |
Autoclavable | Yes |