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
US Plastic Corporation MINI POLYPROPYLENE FUNNEL
These polypropylene and high density polyethylene funnels have many uses. They are inexpensive, lightweight, and durable. They have numerous general applications in the laboratory.
Grainger Fast Fill Funnel 1 qt. 1 Dia Spout
The Funnel King Fast Fill Spout Funnel is a polyethylene funnel designed for fast pouring. It has a 6 inch diameter top opening that tapers down to a 1-1/4 inch diameter spout. The overall height is 9 inches. This durable, chemical resistant funnel has a ribbed exterior for a non-slip grip. It can transfer up to 5 gallons per minute. The spout has a cap for dust protection. This funnel is ideal for automotive fluids, chemicals, grain and feed.
BURKLE INC Disposable liquid funnel PS, Ø 3.94 in. (100 mm), white
Disposable funnel for reliable filling of liquids, ideal for filling bottles and other containers with a narrow filler opening.
The disposable funnel ensures no loss when transferring liquid samples or free-flowing solids. That makes this practical and hygienic pouring aid a helpful accessory for sampling or in laboratories.
Clean room produced funnel with suspension eye and venting fins for ventilation to ensure uniform flow while pouring.
In combination with a filter paper the disposable funnel is also well suited for filtering.
Chemglass Life Sciences Funnel, Process Reactor, Large, Polypropylene, 14.1L Capacity, 350mm Top, 80mm Flange
Funnel, Process Reactor, Large, Polypropylene, 14.1L Capacity, 350mm Top, 80mm Flange. Large funnels have a 80mm flange fused to the bottom of the funnel. This design makes them ideal for filling Chemglass's process reactors by clamping the funnel directly to the powder addition port. The wide mouth funnel has a large opening to optimize flow. The 4.3L size has a handle at the rim. Main body and flange are made from Polypropylene. Funnels are autoclavable at 121C (250F).