Funnels
Funnels
Laboratory funnels, adapted into different forms to suit numerous specialized needs, including filtration, are ubiquitous in the lab. Funnels fitted with filter paper, as well as Buchner and Hirsch funnels, can remove fine particles from a liquid, although a sintered glass frit is suggested for more demanding filtering applications. Funnels and filtration methods are available made from plastic, glass, metal or porcelain to fit any laboratory needs. Plastic funnels that do not come into contact with solvents are generally used for transferring powders, while polyethylene funnels are used for aqueous solution transfers. Glass funnels are noted for their inertness compared to metal and plastic, while metal funnels won't chip, break or corrode.
A variety of laboratory funnels are available. Made from glass, metal, plastic, or porcelain, they are designed for general and specific purposes. Glass reusable funnels are suitable for most uses that involve chemicals.
The standard funnel shape is conical with the sides at an approximate 60 degree angle. Glass and polypropylene powder funnels may have a larger diameter stem, or no stem at all. If liquids are being filtered using filter paper, ribs on the surface of the bowl can help prevent vapor lock.
Other types of funnels include:
- Weighing Funnels: Function as weighing dishes for solid materials; can be used to transfer the weighed solid to another vessel
- Thistle Tube Funnels: Have a reservoir attached to a long narrow neck; typically used to transfer a small amount of liquid to another vessel, sometimes to a specific location
- Filtering Funnels: Include both Hirsch (conical) and Buchner (cylindrical) funnels with integral filtering surfaces or frits; used to remove particulates from a liquid mixture or for filtrations where filter paper use is not an option
- Separatory Funnels: Cylindrical or globe-shaped vessels with an upper opening and a stopcock-controlled bottom opening; used with liquid-liquid extractions to facilitate the removal of the lower (typically aqueous) layer
- Filling Funnels: Standard conical shape; used to transfer liquids or more easily add liquids to containers with narrow openings
- Special Purpose Funnels: Includes safety or air vent funnels; used to safely transfer solvents, thinners, oils, paint wastes, and other hazardous materials to storage or disposal containers
- Dropping Funnels: Small, graduated reservoirs with a stopcock exit opening; for dropwise or measured liquid dispensing
BRAND™ Plain Interior Polypropylene Funnels
An excellent option with high temperature resistance for general laboratory use.
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BRAND™ Polypropylene Powder Funnels
Constructed of durable, lightweight polypropylene. Brand™ Polypropylene Powder Funnels are an excellent option for the transfer of samples without flow rate restrictions.
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Fisherbrand™ Soda Lime Glass Short Stem Funnel
Manufactured from soda lime glass. Fisherbrand™ Soda Lime Glass Short Stem Funnel is less likely to clog when funneling thicker substances.
Quickfit™ Funnel with Ground Glass Cone
Manufactured from chemically resistant Pyrex™ Borosilicate Glass. Quickfit™ Funnel with Ground Glass Cone is designed for transferring powders into Quickfit™ flasks and vessels.
Kartell™ Polypropylene Analytical Funnels
Manufactured with polypropylene for strength and durability. Kartell™ Polypropylene Analytical Funnels are designed specifically for analytical chemistry.
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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.
DWK Life Sciences DURAN™ Buechner Funnel, Slit Slieve Support
Buechner funnels are cylinders with an integrated large-pored sieve plate.
Fisherbrand™ Borosilicate Glass Weighing Funnels
Introduce powder via the tubular stem. Fisherbrand™ Borosilicate Glass Weighing Funnels are ideal for weighing small quantities of powder.
Fisherbrand™ Borosillicate Glass Funnel
Plain glass funnel manufactured from borosilicate glass. Fisherbrand™ Borosilicate Glass Funnel is ideal for use with funneling liquids in laboratory applications.
Fisherbrand™ Glass Conical Separating Funnel with PTFE Stopcock
Manufactured from Borosilicate Glass and ISO 4800 Certified. Fisherbrand™ Glass Conical Separating Funnel with PTFE Stopcock is supplied with a glass and plastic stopper. Available with interchangeable glass or PTFE stopcock.
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Bel-Art™ SP Scienceware™ Büchner Funnels
Lightweight, but not top-heavy.
Scientific Glass Labs™ Borosilicate Glass Powder Funnel
Manufactured from borosilicate glass. Scientific Glass Labs™ Borosilicate Glass Powder Funnel is less likely to clog or cake when funneling powdery substances.
Fisherbrand™ Soda Lime Glass Funnel
Plain glass funnel manufactured from soda lime glass. Fisherbrand™ Soda Lime Glass Funnel is ideal for use with funneling liquids in laboratory applications.
Kartell™ Polypropylene Buchner Funnels
Manufactured from robust, lightweight polypropylene for durability and excellent chemical resistance. Kartell™ Polypropylene Buchner Funnels with an integral filter is ideal for separating solids from liquids in a laboratory.
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