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.
Supertek™ Glass Filter Funnel with Low Stem
The body of the Glass Filter Funnel with Low Stem is a 60° angle.
Dynalon™ Büchner Funnels
Easily separated for cleaning.
Cytiva MicroFunnel™ Filter Funnel Adapters, Blue, Polyethylene; For Vacuum Manifold when using Rubber Stopper
Increase Laboratory Efficiency with Ready-To-Use Disposable Filter Funnels-Each lot is certified for microbiological analysis to provide added assurance of reliable results.-Unique squeeze separation of cylinder from base allows easy access to membrane.-Individually bagged, disposable filter units prevent cross-contamination of samples.-The 100 mL funnels are marked in 10 mL incrementsand the 300 mL funnel is marked in 50 mL increments.-Disposable design eliminates the cleaning and sterilization required with reusable funnels.-Ready to use, pre-assembled and gamma-irradiated to eliminate the potential for toxic extractables associated with EtO sterilization.-Variety of options. Choose from GN-6 Metricel membrane in 0.45 μm pore size, Supor membrane with 0.2 or 0.45 μm pore size, or Metricel Black membrane with 0.45 or 0.8 μm pore size.-This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) Magnetic Filter Funnel, 500 mL, 47 mm (1/pkg)
Unique Magnetic Seal Allows Easy, One-Handed Vacuum Filtration of Liquids-No-leak magnetic seal allows one-hand operation. -Polyphenylsulfone construction is compatible with anti-foaming agents and many other solvents.-Convenient. 150 mL size allows for easy fit into small autoclaves and 500 mL size is ideal for filtration of large samples.-Sturdy and safe. Polyphenylsulfone construction provides durability and added safety at a cost less than most glass funnels.-Forceps access point allows easy filter retrieval.-Graduated at 50 mL increments for accurate sample measurement.-New 47 mm Sentino Magnetic Filter Funnels also available.-#8 stopper with proper bore hole size included This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva MicroFunnel™ Plus Filter Funnel with Aseptic Port (AP) and Supor Membrane, 100 mL, 0.45 µm, White, Gridded, Sterile, Individually Bagged (50/pkg)
Combined Filter Funnel and Sample Cup Revolutionizes Water System Monitoring to Eliminate the Risk of Contamination-Product performs as sample container and filter funnel all in one. -MicroFunnel Plus AP unit allows aseptic collection of the sample through the lid sample port. No need to remove lid.-MicroFunnel Plus products with Supor membrane are designed to allow sampling of hot water up to 90°C-Vented lid snaps to a liquid-tight seal and allows filtration without having to open the funnel and risk introducing contamination.-Vent filter ensures no airborne contamination is drawn into the funnel during filtration.-Attaches directly to a standard laboratory manifold or use with adapter and stopper.-Volume graduations are clearly marked for ease in measuring your sample volume.-Individually bagged and labeled for contamination control and lot traceability. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) 47 mm Filter Funnels, Glass - Glass filter funnel with sidearm support assembly and flask (300 mL funnel with 1 L flask) (1/pkg)
The 47 mm glass filter funnels are made of 100% borosilicate glass and they offer excellent chemical compatibility even with the most aggressive solvents.-Borosilicate glass-Chemical compatibility-Ideal for filtration and degassingThe glass filter funnels are ideal for filtration and degassing of HPLC solvents, aqueous mobile phase solutions, and buffers.Ordering information: Materials of Construction: All parts are borosilicate glass except for the clamp and the stopper. The clamp is made of aluminum. The number 8 stopper is made of silicone. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) MicroFunnel™ Plus Filter Funnel with Supor Membrane, 100 mL, 0.45 m, White, Gridded, Sterile, Individually Bagged (40/pkg)
Combined Filter Funnel and Sample Cup Revolutionizes Water System Monitoring to Eliminate the Risk of Contamination-Product performs as sample container and filter funnel all in one. -MicroFunnel Plus AP unit allows aseptic collection of the sample through the lid sample port. No need to remove lid.-MicroFunnel Plus products with Supor membrane are designed to allow sampling of hot water up to 90C-Vented lid snaps to a liquid-tight seal and allows filtration without having to open the funnel and risk introducing contamination.-Vent filter ensures no airborne contamination is drawn into the funnel during filtration.-Attaches directly to a standard laboratory manifold or use with adapter and stopper.-Volume graduations are clearly marked for ease in measuring your sample volume.-Individually bagged and labeled for contamination control and lot traceability. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva Support screen, type 304 stainless steel (1/pkg)
Unique Magnetic Seal Allows Easy, One-Handed Vacuum Filtration of Liquids-No-leak magnetic seal allows one-hand operation. -Polyphenylsulfone construction is compatible with anti-foaming agents and many other solvents.-Convenient. 150 mL size allows for easy fit into small autoclaves and 500 mL size is ideal for filtration of large samples.-Sturdy and safe. Polyphenylsulfone construction provides durability and added safety at a cost less than most glass funnels.-Forceps access point allows easy filter retrieval.-Graduated at 50 mL increments for accurate sample measurement.-New 47 mm Sentino Magnetic Filter Funnels also available.-#8 stopper with proper bore hole size included This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva 47 mm Filter Funnels, Glass - Fritted glass support base/No. 8 silicone stopper (1/pkg)
The 47 mm glass filter funnels are made of 100% borosilicate glass and they offer excellent chemical compatibility even with the most aggressive solvents.-Borosilicate glass-Chemical compatibility-Ideal for filtration and degassingThe glass filter funnels are ideal for filtration and degassing of HPLC solvents, aqueous mobile phase solutions, and buffers.Ordering information: Materials of Construction: All parts are borosilicate glass except for the clamp and the stopper. The clamp is made of aluminum. The number 8 stopper is made of silicone. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) MicroFunnel™ Plus Filter Funnel with Metricel Black Membrane, 100 mL, 0.45 m, Black, Gridded, Sterile, Individually Bagged (50/pkg)
Combined Filter Funnel and Sample Cup Revolutionizes Water System Monitoring to Eliminate the Risk of Contamination-Product performs as sample container and filter funnel all in one. -MicroFunnel Plus AP unit allows aseptic collection of the sample through the lid sample port. No need to remove lid.-MicroFunnel Plus products with Supor membrane are designed to allow sampling of hot water up to 90C-Vented lid snaps to a liquid-tight seal and allows filtration without having to open the funnel and risk introducing contamination.-Vent filter ensures no airborne contamination is drawn into the funnel during filtration.-Attaches directly to a standard laboratory manifold or use with adapter and stopper.-Volume graduations are clearly marked for ease in measuring your sample volume.-Individually bagged and labeled for contamination control and lot traceability. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva MicroFunnel™ Plus Filter Funnel with Supor Membrane, 100 mL, 0.45 µm, White, Gridded, Sterile, Individually Bagged (50/pkg)
Combined Filter Funnel and Sample Cup Revolutionizes Water System Monitoring to Eliminate the Risk of Contamination-Product performs as sample container and filter funnel all in one. -MicroFunnel Plus AP unit allows aseptic collection of the sample through the lid sample port. No need to remove lid.-MicroFunnel Plus products with Supor membrane are designed to allow sampling of hot water up to 90°C-Vented lid snaps to a liquid-tight seal and allows filtration without having to open the funnel and risk introducing contamination.-Vent filter ensures no airborne contamination is drawn into the funnel during filtration.-Attaches directly to a standard laboratory manifold or use with adapter and stopper.-Volume graduations are clearly marked for ease in measuring your sample volume.-Individually bagged and labeled for contamination control and lot traceability. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) Filter Funnel Holder for Collecting Hot Water Loop Samples, 100 mL (1/pkg)
Combined Filter Funnel and Sample Cup Revolutionizes Water System Monitoring to Eliminate the Risk of Contamination-Product performs as sample container and filter funnel all in one. -MicroFunnel Plus AP unit allows aseptic collection of the sample through the lid sample port. No need to remove lid.-MicroFunnel Plus products with Supor membrane are designed to allow sampling of hot water up to 90C-Vented lid snaps to a liquid-tight seal and allows filtration without having to open the funnel and risk introducing contamination.-Vent filter ensures no airborne contamination is drawn into the funnel during filtration.-Attaches directly to a standard laboratory manifold or use with adapter and stopper.-Volume graduations are clearly marked for ease in measuring your sample volume.-Individually bagged and labeled for contamination control and lot traceability. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) MicroFunnel™ Filter Funnel with Polycarbonate Membrane, 300 mL, 0.4 m, Sterile, Individually Bagged (20/pkg)
Ideal for Concentrating Organisms in Fluid Samples-Flat, smooth surface allows for easy elution of organisms or particulate.-Collection of organisms or particulate on one planar surface is ideal prior to electron microscopy (SEM) or light microscope (LM) techniques.-Ready-to-use, disposable design eliminates sample cross contamination. This product is not approved for use in medical, clinical, surgical or other patient applications.
Cytiva (Formerly Pall Lab) Stainless Steel (304) Filter Funnel Replacement Support Screen, 47 mm
Ultimate Chemical Resistance and Easy Assembly-Quick, easy assembly. Funnels weight seals filter to base. -100 mL capacity with 50 mL calibration facilitates easy measurement.-Stainless steel construction offers excellent chemical resistance. This product is not approved for use in medical, clinical, surgical or other patient applications.