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.
- (57)
- (3)
- (160)
- (51)
- (2)
- (5)
- (4)
- (1)
- (1)
- (2)
- (4)
- (1)
- (2)
- (2)
- (7)
- (6)
- (1)
- (35)
- (33)
- (60)
- (6)
- (6)
- (5)
- (1)
- (1)
- (2)
- (1)
- (11)
- (20)
- (1)
- (33)
- (2)
- (3)
- (1)
- (1)
- (7)
- (4)
- (1)
- (1)
- (11)
- (1)
- (4)
- (1)
- (3)
- (1)
- (11)
- (10)
- (1)
- (1)
- (2)
- (1)
- (1)
- (10)
- (10)
- (1)
- (7)
- (1)
- (1)
- (1)
- (3)
- (6)
- (2)
- (2)
- (11)
- (1)
- (1)
- (1)
- (11)
- (41)
- (32)
- (1)
- (1)
- (2)
- (1)
- (1)
- (1)
- (19)
- (1)
- (1)
- (7)
- (7)
- (2)
- (1)
- (1)
- (1)
- (1)
- (28)
- (5)
- (54)
- (3)
- (1)
- (3)
- (1)
- (41)
- (1)
- (14)
- (3)
- (5)
- (1)
- (10)
- (4)
- (1)
- (7)
- (8)
- (2)
- (9)
- (2)
- (3)
- (5)
- (1)
- (1)
- (1)
- (2)
- (3)
- (1)
- (1)
- (10)
- (5)
- (1)
- (4)
- (1)
- (2)
- (1)
- (10)
- (1)
- (1)
- (1)
- (1)
- (6)
- (1)
- (6)
- (1)
- (1)
- (1)
- (3)
- (1)
- (1)
- (4)
- (1)
- (3)
- (1)
- (1)
- (1)
- (1)
- (1)
- (1)
- (6)
- (1)
- (1)
- (2)
- (1)
- (2)
- (4)
- (1)
- (1)
- (4)
- (4)
- (3)
- (1)
- (2)
- (4)
- (4)
- (2)
- (1)
- (2)
- (4)
- (3)
- (5)
- (3)
- (7)
- (1)
- (1)
- (2)
- (1)
- (4)
- (1)
- (1)
- (1)
- (1)
- (1)
- (1)
- (3)
- (7)
- (1)
- (2)
- (3)
- (9)
Filtered Search Results
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 |
---|---|
Product Type | Filter funnel |
Material | Borosilicate Glass |
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 |
---|---|
Material | Pyrex Glass,Borosilicate Glass |
Certifications/Compliance | NF B 35 032 |
Product Type | Buchner filter funnel |
---|---|
Material | Borosilicate Glass |
For Use With (Application) | Highly resistant to most chemicals such as solvents, acids and alkalis |
BRAND™ Borosilicate Glass 3.3 Filter Funnels
Manufactured from chemically resistant borosilicate glass, these funnels are an excellent option for filtering in the laboratory.
Product Type | Filter funnel |
---|---|
Color | Clear |
Quantity | 1/Pk. |
Material | Borosilicate Glass |
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™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 |
---|---|
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 |
Lenz Laborglasinstrumente™ Filter Funnels
Made of borosilicate glass. Lenz Laborglasinstrumente™ Filter funnels are ideal for separating solids from liquids via laboratory filtration.
Quantity | 1 |
---|---|
Material | Borosilicate Glass |
Porosity | 3 |
Product Type | Buechner filter funnel |
---|---|
Length (Metric) Stem | 10 mm |
Material | Borosilicate Glass |
For Use With (Application) | Filtration |
Witeg™ Filter Funnels
Witeg™ Filter Funnels include a filter disc for separating materials from liquid solutions.
Product Type | Filter funnel |
---|
Material | Borosilicate Glass 3.3 |
---|
Fisherbrand™ Porcelain Buchner Funnels
Excellent for separating liquids from solids in the laboratory. Fisherbrand™ Porcelain Buchner Funnels provide a quick and easy pressure assisted filtration method.
Product Type | Buchner Funnel |
---|---|
Quantity | 1Each |
Material | Porcelain |
DWK Life Sciences DURAN™ Filter Funnel
Filter funnels are filters that are used for solid-liquid separation by means of vacuum.
Quantity | 1 Ea. |
---|---|
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 |
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.
Quickfit™ Glass Büchner Funnel with Glass Sintered Disc
Used in place of conventional filter papers that would be destroyed by acids and alkalis. Quickfit™ Glass Büchner Funnel with Sintered Glass Disc is manufactured from chemical-resistant borosilicate glass. Integral ground glass cone on stem connects to Quickfit™ Büchner flasks and vessels.
Pore Size | 16 to 40μm |
---|---|
Includes | Sintered glass disc, ground glass cone |
Product Type | Buchner filter funnel |
Material | Borosilicate Glass |
Porosity | 3 |
For Use With (Application) | Bases or acids that can destroy conventional filter papers |
Kartell™ Polypropylene Analytical Funnels
Manufactured with polypropylene for strength and durability. Kartell™ Polypropylene Analytical Funnels are designed specifically for analytical chemistry.
Material | Polypropylene |
---|---|
For Use With (Application) | Suitable for foodstuff |
Autoclavable | Yes |