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
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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Material | Pyrex Glass,Borosilicate Glass |
Certifications/Compliance | NF B 35 032 |
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 |
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 |
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 |
Pyrex™ Hirsch Pattern Vacuum Filtration Funnel with Sintered Glass Disc
Manufactured from Pyrex™ borosilicate glass for high resistance to chemical corrosion. Pyrex™ Hirsch Pattern Vacuum Filtration Funnel with Sintered Glass Disc is ideal for filtering semi-micro quanitities of material and eliminates the need for filter papers.
Thermo Scientific™ Nalgene™ Single Use Analytical Filter Funnels
SureTRACE
Supports traceability with guaranteed access to certificates and proactive change notifications.
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Supports traceability with guaranteed access to certificates and proactive change notifications.
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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) Membrane | 47 mm |
Pyrex™ Funnel with Sintered Glass Disc
Manufactured from Pyrex™ Borosilicate Glass. Pyrex™ Funnel with Sintered Glass Disc is used for the filtration of solutions. Resistant to most corrosive agents, and eliminates the need for filter paper.
Includes | Sintered glass disc |
---|---|
Product Type | Filter funnel |
Material | Pyrex Glass,Borosilicate Glass |
For Use With (Application) | For filtration of solutions |
Diameter (Metric) Stem | 8mm |
Kartell™ Polypropylene Analytical Funnels
Manufactured with polypropylene for strength and durability. Kartell™ Polypropylene Analytical Funnels are designed specifically for analytical chemistry.
Material | Polypropylene |
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For Use With (Application) | Suitable for foodstuff |
Autoclavable | Yes |
Graduated | Yes |
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Material | Polypropylene |
For Use With (Application) | Variety of laboratory applications |
Thermo Scientific™ Nalgene™ Reusable Bottle Top Filters
Combine the convenience of a bottle top filter with the savings of a reusable bottle top filter. Screw securely onto glass media bottles with 33 or 45mm neck sizes.
Material | Polysulfone |
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Autoclavable | Autoclavable |
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 |
Thermo Scientific™ Filtration Hardware, Accessories, and Spare Parts
Thermo Scientific™ Nalgene™ filtration hardware and accessories can be used in a wide range of applications and in conjunction with our various lines of filtration devices.
Product Type | Micro filter funnel |
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Material | Borosilicate Glass |
For Use With (Application) | Highly resistant to most chemicals such as solvents, acids and alkalis |
Diameter (Metric) Stem | 6mm |
Thermo Scientific™ Nalgene™ Reusable Analytical Funnels
Use this filter holder with funnel with any filtering flask or manifold that accepts a suitable rubber stopper with hole.
Material | Polysulfone |
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Autoclavable | Autoclavable |