Filling Funnels
Funnels have a conical shape and short, wide stems for filling bottles or transferring powders. Filling funnels typically have a 60-degree angle that permits accurate fitting of filter paper, as well as vents or flutes to reduce vacuum formation and decrease filtering time.
Filling Funnel Materials
Glass
Borosilicate glass filling funnels include a strong beaded edge that resists chipping. Their resistant structure allows for the use of various reagents and chemicals. They also have a high resistance to thermal and mechanical shock and chemical attack. Funnels made from flint glass and soda-lime glass are also available.
Plastic
Plastic filling funnels may be disposable or reusable and are made from polystyrene, polypropylene, polyethylene (LDPE or HDPE), or other resins.
Metal
Metal funnels are durable and reusable and may be constructed from a variety of metals. Each has characteristics that facilitate a particular use and purpose.
Filling funnels are available in a range of sizes and dimensions. They are typically sized based on capacity — the volume they can contain. Dimensionally, they may vary in top diameter, stem length, stem diameter, bowl angle, bowl capacity, and overall length. Filling funnels may be classified as Class A or Class B based on tolerances specified by ASTM and other standards.
What Different Types of Glass Funnels Are Available?
• General-purpose glass filling funnels for channeling, filling, and decanting liquids
• Short-stem or powder funnels to prevent the stem from clogging during the handling of fine powders
• Long-stem analytical funnels, often used with filter papers
• Fluted funnels to help reduce vacuums and facilitate more rapid filtration
• Büchner, glass-filtering, or vacuum filtration funnels made with an integral sintered glass disc for filtering precipitates or particulates without the need for filter papers. The sintered discs come in a range of pore sizes, typically from 10 to 40 μm
• Pear-shaped separatory funnels (separating or separation funnels) fitted with a stopper and a PTFE or glass stopcock for separating layered immiscible liquids in chemistry applications
• Weighing funnels to function as weighing dishes and to transfer weighed solids to other vessels
Thomas Scientific STERIWARE BLUE LIQUID FUNNEL,
SteriWare Blue Liquid Funnel, PP,100mm Top Diameter, Sterile
Chemglass Life Sciences 100mm Powder Funnel, Offset, 24/40 Inner Joint, C to C Offset is 40mm
100mm Powder Funnel, Offset, 24/40 Inner Joint, C to C Offset is 40mm. Funnel has a lower stem made with an offset to permit use with multi-neck flasks.
Chemglass Life Sciences 100mL Powder Addition Funnel, 24/40 Joint Size, Auger A
100mL Powder Addition Funnel, 24/40 Joint Size, Auger A. Facilitates the delivery of free-flowing, granular solids into reactions. Pressure equalizing arm is equipped with a vented stopper for air-free operations and also permits access into the delivery stem for easy clean-out. One piece, easily removed grooved PTFE auger delivers powders at a uniform rate. Funnel has a lower inner joint and top outer, both being the size listed.
Chemglass Life Sciences 50mm Powder Funnel, 14/20 Inner Joint
50mm Powder Funnel, 14/20 Inner Joint. Useful for the introduction of solids or liquids into reactions under atmospheric conditions. Funnels have 60º side angle and a standard taper inner joint.
Grainger Folding Funnel 12 oz 1/2 Dia Spout
The Funnel King Folding Spout Funnel is a polyethylene funnel with a folding spout that can be folded down for compact storage. It has a wide mouth opening and tapered body to easily guide liquids or powders into containers and features a flexible spout that folds down flat against the funnel body. This folding funnel has a 6 inch diameter mouth opening and stands 5 inches tall. It's made from durable polyethylene plastic and can hold up to 1 quart of liquid. The folding spout design allows this funnel to take up less space for convenient storage.
Bellco Glass, Inc. Manufactured from Type 1 Class A Borosilicate Glass. Ideal for use of filling other glass vessels. Receiving vessel is placed under bell to maintain sterility during filling. Attaches to reservoir with rubber tubing. Dimensions: 22x75mm Tubing siz
Manufactured from Type 1 Class A Borosilicate Glass. Ideal for use of filling other glass vessels. Receiving vessel is placed under bell to maintain sterility during filling. Attaches to reservoir with rubber tubing. Dimensions: 22x75mm Tubing siz
Chemglass Life Sciences 150mm Powder Funnel, 45/50 Inner Joint
150mm Powder Funnel, 45/50 Inner Joint. Useful for the introduction of solids or liquids into reactions under atmospheric conditions. Funnels have 60º side angle and a standard taper inner joint.