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
Eisco™ Glass Funnel Filters
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Eisco™ Glass Funnel Filters are made from high quality borosilicate glass and designed with an angled stem and beaded rim for durability.
Angle | 60° |
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Material | Borosilicate Glass |
Eisco™ Plastic Filter Funnels
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Eisco™ Plastic Filter Funnels are constructed of polyethylene which is chemical, acid, and alkaline resistant.
Color | Clear |
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Material | Polyethylene |
Eisco™ Porcelain Buchner Funnel
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Eisco™ Porcelain Buchner Funnel features a thick stem and fixed perforated plate.
Color | White |
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Quantity | 1 |
Material | Porcelain |
For Use With (Application) | Filtering |
United Scientific™ Porcelain Hirsch Funnel
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These Hirsch funnels offer laboratory grade porcelainware at substantial cost savings.
Product Type | Hirsch Funnel |
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Color | White |
Material | Porcelain |
United Scientific™ Porcelain Buchner Funnel
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These Buchner funnels offer laboratory grade porcelainware at substantial cost savings.
Product Type | Buchner Funnel |
---|---|
Color | White |
Material | Porcelain |
Eisco™ Heavy Duty Glass Filter Funnels
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Eisco™ Heavy Duty Glass Filter Funnels feature a thick wall design for enhanced durability.
Angle | 60° |
---|---|
Color | Clear |
Quantity | 1 |
Graduated | No |
Material | Borosilicate Glass |
For Use With (Application) | Transferring liquids |
Autoclavable | Autoclavable |
United Scientific™ Polypropylene Buchner Funnels
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Funnels offer high quality and value.
Product Type | Funnel |
---|---|
Color | White |
Material | Polypropylene |
Eisco™ Polypropylene Separating Funnel, PTFE Key Stopcock
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Polypropylene separatory funnels provide excellent contact clarity and durability. Include push fitted plugs with self lubricating PTFE key stopcocks and polypropylene screw caps. Autoclavable.
Diameter (Metric)Top | 3.2 cm |
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Quantity | 1 |
Graduated | No |
Material | Polypropylene |
For Use With (Application) | transferring liquids |
Autoclavable | Yes |
Eisco™ Polypropylene Buchner Funnels
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Two piece polypropylene Buchner funnels are light weight and autoclavable. The top portion of the funnel cone is fitted with the lower portion of the funnel cone forming a vacuum seal that does not require greasing. Bottom portion of the funnel cone has a perforated filter plate.
Product Type | Plain stem |
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Material | Polypropylene |
For Use With (Application) | Filtering liquids |
Autoclavable | Yes |
Eisco™ Glass Buchner Funnel - Plain Stem
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Glass Buchner funnels with plain stems and G-3 sintered disks
Product Type | G-3 |
---|---|
Color | Clear |
Quantity | 1 |
Material | Borosilicate Glass |
For Use With (Application) | filtering liquids |
Autoclavable | Yes |
United Scientific™ Borosilicate Glass Buchner Funnel with Fritted Disc
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Glass funnels that come with a fritted disc.
Includes | Fritted Disk |
---|---|
Product Type | Buchner Funnel |
Color | Clear |
Material | Borosilicate Glass |
Autoclavable | Autoclavable |
United Scientific™ Polypropylene Double Funnel Holder
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Plastic funnel holder that will not rust like other materials do.
United Scientific Supplies Table Top Porcelain Buchner Funnel
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Autoclavable and ideal for vacuum filtration use
Product Type | Buchner Funnel |
---|---|
Color | White |
Material | Porcelain |
Autoclavable | Autoclavable |
Eisco™ Glass Buchner Funnels with Jointed Stems
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Glass Buchner funnels with jointed stems and G-3 sintered disks. Made from high quality borosilicate 3.3 glass.
Color | Clear |
---|---|
Quantity | 1 |
Material | Borosilicate Glass |
For Use With (Application) | Filtering liquids |
Autoclavable | Yes |
Corning™ PYREX™ Hirsch Type, Fritted Disc
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Very useful in preparation work.
Includes | Fritted discs |
---|---|
Product Type | Hirsch Funnel |
Material | Pyrex Glass |
Certifications/Compliance | ASTM E128 |
For Use With (Application) | Preparative work, or in making separations |
Diameter (Metric) Stem | 8mm |