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
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 | Boro 3.3 |
For Use With (Application) | Qualitative inorganic analysis and preparative chemistry; Fine filtration; Fine filtration; Filtration at reduced pressure; Filtering |
Autoclavable | Yes |
Bel-Art™ Scienceware™ PMP Urbanti High-speed Filter Paper
Unsurpassed for non-vacuum, high-speed filtration
Quickfit™ Borosilicate Glass Büchner Vacuum Filtration Funnels with Glass Sintered Disc
Useful where conventional filter papers would be destroyed by acids and alkalis
Material | Borosilicate Glass |
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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. |
---|---|
Material | Boro 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 |
DWK Life Sciences DURAN™ Filter Funnel, conical shape
The filter funnel has a melted filter plate and is used for filtration without vacuum. When using the filter funnel, a filter paper can be dispensed with.
Diameter (Metric)Top | 55 mm |
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Capacity (Metric) | 25 mL |
Quantity | 1 Ea. |
Material | Boro 3.3 |
For Use With (Application) | Filtering of liquids; Filtration without filter paper; The spillage of substances is avoided; Filtering |
Autoclavable | Yes |
DWK Life Sciences DURAN™ Micro Filter Funnel
Micro filter funnels are filters with which very small quantities of solution can be filtered.
Diameter (Metric)Top | 10 mm |
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Capacity (Metric) | 2 mL |
Quantity | 10/Pk. |
Material | Boro 3.3 |
For Use With (Application) | Filtration of very small quantities; Filtration at reduced pressure; Qualitative inorganic analysis and preparative chemistry; Filtering |
Autoclavable | Yes |
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 | Pyrex Glass,Borosilicate Glass |
Diameter (Metric) Stem | 30mm |
Pyrex™120mm Diameter Glass Büchner Filter Funnel
Manufactured from chemically resistant Pyrex™ glass. Pyrex™ 120mm 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) | 290 mm |
Diameter (Metric) Disc | 120mm |
Product Type | Buchner filter funnel |
Length (Metric) Stem | 120mm |
Capacity (Metric) | 1000 mL |
Material | Pyrex Glass,Borosilicate Glass |
For Use With (Application) | For easy filtering solutions |
Diameter (Metric) Stem | 19mm |
PYREX™ 95mm Diameter Glass Buchner Filter Funnel
Manufactured from chemically resistant Pyrex™ borosilicate glass. Pyrex™ 95mm Glass Buchner Filter Funnel 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 |
---|---|
Height (Metric) | 250 mm |
Diameter (Metric) Disc | 95mm |
Capacity (Metric) | 500 mL |
Material | Pyrex Glass,Borosilicate Glass |
Diameter (Metric) Stem | 19mm |
Pyrex™ 30mm Diameter Glass Büchner Filter Funnel
Manufactured from chemically resistant Pyrex™ borosilicate glass. Pyrex™ 30mm 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 |
---|---|
Height (Metric) | 160 mm |
Diameter (Metric) Disc | 30mm |
Product Type | Buchner filter funnel |
Length (Metric) Stem | 100mm |
Capacity (Metric) | 35 mL |
Material | Pyrex Glass,Borosilicate Glass |
For Use With (Application) | For convenient filtration of solutions |
Diameter (Metric) Stem | 8mm |
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 |
---|---|
Height (Metric) | 180 mm |
Diameter (Metric) Disc | 60mm |
Length (Metric) Stem | 100mm |
Capacity (Metric) | 125 mL |
Material | Pyrex Glass,Borosilicate Glass |
For Use With (Application) | For convenient filtration of solutions |
Diameter (Metric) Stem | 13mm |
Pyrex™ 40mm Diameter Glass Büchner Filter Funnel
Manufactured from chemically resistant Pyrex™ borosilicate glass. Pyrex™ 40mm 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.
Height (Metric) | 170 mm |
---|---|
Diameter (Metric) Disc | 40mm |
Product Type | Buchner filter funnel |
Length (Metric) Stem | 100mm |
Capacity (Metric) | 50 mL |
Material | Pyrex Glass,Borosilicate Glass |
Diameter (Metric) Stem | 8mm |
DWK Life Sciences Funnel with Scale for DURAN™ Filtering Apparatus, Funnel Only
The filter unit can be used with an appropriate filter for particle analysis or clear and sterile filtration. Filtration support by vacuum is possible.
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 |
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 |