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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BRANDTECH™ VITLAB™ Polypropylene Funnels
BrandTech polypropylene funnels with its steep 60° angle, encourages swift and rapid transfers.
Couleur | Clear |
---|---|
Température max. (impériale) | 257°F |
Angle | 60° |
Type de produit | Filtering Funnel |
Matériau | Polypropylene |
Graduée | Yes |
Température max. (métrique) | 125°C |
Autoclavable | Autoclavable |
À utiliser avec (application) | Variety of laboratory applications |
Fisherbrand™ Porcelain Buchner Funnels with Fixed Perforated Plates
For suction filtration applications
Type de produit | Buchner Funnel |
---|---|
Matériau | Porcelain |
Quantité | Each |
Comprend | Fixed perforated plate |
Autoclavable | Autoclavable |
À utiliser avec (application) | Suction filtration applications |
Bel-Art™ Single-Piece Buchner Funnels
One-piece HDPE with sealed-in, polyethylene Fritware™ porous filter plate
Description | Fritware™ polyethylene filter |
---|---|
Température max. (impériale) | 125°F |
Type de produit | Buchner Funnel |
Matériau | HDPE |
Comprend | Fritware™ polyethylene filter |
Porosité | 90 to 130μ |
Température max. (métrique) | 52°C |
Eisco™ Glass Funnel Filters
Eisco™ Glass Funnel Filters are made from high quality borosilicate glass and designed with an angled stem and beaded rim for durability.
Couleur | Clear |
---|---|
Angle | 60° |
Type de produit | Filter Funnel |
Matériau | Borosilicate Glass |
MilliporeSigma™ Glass Funnel for Vacuum Filtration
Designed to replace parts contained in glass vacuum filtration kits or provide for an alternative configuration
Couleur | Clear |
---|---|
Diamètre (métrique) supérieur | 47 mm |
Synthware™ Buchner Filter Funnels
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Used to filter particulates from a variety of substances
Type de produit | Buchner Funnel |
---|
Synthware™ Filter Funnel
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Funnel features a fritted disc and can be used to filter particulates from a variety of substances.
Couleur | Clear |
---|---|
Type de produit | Filter Funnel |
Numéro de joint | 24/40 |
Matériau | Borosilicate Glass (3.3) |
Porosité | Extra Coarse |
À utiliser avec (application) | Filtering Media |
Thermo Scientific™ Nalgene™ Büchner Two-Piece Polypropylene Funnels
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Separate the lightweight and durable two-piece polypropylene funnels for easy cleaning. These funnels won't chip, crack or break.
Matériau | Polypropylene |
---|---|
Autoclavable | Autoclavable |
Sartorius Funnels for Combisart™
Reusable stainless steel Combisart™ Funnels for microbial enumeration and particle counting.
À utiliser avec (équipement) | Combisart Funnel |
---|---|
Matériau | Stainless Steel |
Quantité | 1 Ea. |
Eisco™ Plastic Filter Funnels
Eisco™ Plastic Filter Funnels are constructed of polyethylene which is chemical, acid, and alkaline resistant.
Couleur | Clear |
---|---|
Type de produit | Filtering Funnel |
Matériau | Polyethylene |
Type de produit | Buchner Funnel |
---|---|
Matériau | Polypropylene |
Comprend | Molded in perforated PP filter plate |
Autoclavable | Autoclavable |
Synthware™ Buchner Funnels with Perforated Glass Plate
Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”
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With sealed in perforated glass disc to support filter media
Couleur | Clear |
---|---|
Type de produit | Buchner Funnel with Perforated Glass Plate |
Matériau | Borosilicate Glass (3.3) |
Eisco™ Heavy Duty Glass Filter Funnel
Heavy Duty Glass Filter Funnel features a thick wall design for enhanced durability.
Couleur | Clear |
---|---|
Description | Plain stem |
Angle | 60° |
Type de produit | Filter Funnel |
No. of Pores | 1 |
Matériau | Borosilicate Glass |
Quantité | 1 |
Graduée | No |
Autoclavable | Autoclavable |
Matériau (membrane) | Glass |
À utiliser avec (application) | Transferring liquids |
Eisco™ Glass Buchner Funnel - Plain Stem
Glass Buchner funnels with plain stems and G-3 sintered disks
Couleur | Clear |
---|---|
Type de produit | G-3 |
Matériau | Borosilicate Glass |
Quantité | 1 |
Autoclavable | Autoclavable |
À utiliser avec (application) | filtering liquids |
Eisco™ Porcelain Buchner Funnel
Eisco™ Porcelain Buchner Funnel features a thick stem and fixed perforated plate.
Couleur | White |
---|---|
À utiliser avec (équipement) | Filtration |
Description | Glazed porcelain |
Type de produit | Buchner Funnel |
Matériau | Porcelain |
Quantité | 1 |
Autoclavable | Autoclavable |
À utiliser avec (application) | Filtering |