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
Chemglass Life Sciences Funnel, Powder, 75mm, 24/40 Outer
Funnel, Powder, 75mm, 24/40 Outer. Powder funnel is useful for the introduction of solids or liquids into reactions under atmospheric conditions. Funnels have 60 side angle and a standard taper outer joint.
Hach Company Funnel, Analytical, 114 mL Approximate Volume
Standard long stem funnel meets the needs of a wide variety of applications. Mounded ribbing prevents "air lock" commonly occurring during funneling and filtrations. A steep, 58-degree cone slope makes for fast and easy flow of either liquids or small solids. Polypropylene construction is resistant to chemicals and makes this funnel fully autoclavable for sterilization.
Chemglass Life Sciences Chemglass Disposable Filter Funnel, 18 mL, Polyethylene Frit with 500 mg Diatomaceous Earth (Shelf Pack)
Chemglass disposable filter funnel (18 mL) is a single-use filtration device for solid-liquid separations in chemistry and biological laboratories. It uses a polyethylene frit charged with diatomaceous earth to provide consistent filtration and is supplied in a shelf-pack tray for convenient storage and handling.
- 18 mL nominal volume.
- Polyethylene frit loaded with 500 mg diatomaceous earth for consistent filtration performance.
- 80 mm stem length to minimize contamination of vacuum adapters.
- Shelf-pack, shrink-wrapped SBS-coated white tray for convenient handling and storage.
- Compatible with standard glass vacuum adapters and PTFE stopcock for controlled vacuum filtration.
Chemglass Life Sciences 150mm Powder Funnel, Modified, 45/50 Inner Joint, 45mm Flat Sided
150mm Powder Funnel, Modified, 45/50 Inner Joint, 45mm Flat Sided. Similar to CG-1720, but with one side flattened to allow funnel to be used in multi-neck flasks where space is limited. Flat side dimension is the distance between the center of the standard taper inner joint and the flattened side of the funnel. Funnels have 60º angled sides with a standard taper inner joint.
Chemglass Life Sciences 75mm Powder Funnel, 24/40 Inner Joint, 165mm OAL
75mm Powder Funnel, 24/40 Inner Joint, 165mm OAL. Useful for the introduction of solids or liquids into reactions under atmospheric conditions. Funnel has steep sides to permit free-flow of solid materials. With standard taper inner joint.
Chemglass Life Sciences 100mm Powder Funnel, 24/40 Inner Joint, 195mm OAL
100mm Powder Funnel, 24/40 Inner Joint, 195mm OAL. Useful for the introduction of solids or liquids into reactions under atmospheric conditions. Funnel has steep sides to permit free-flow of solid materials. With standard taper inner joint.
Protech International Inc 1/16 (1.6MM) Stainless Steel BUTTON HEAD TORX Screw
1/16 (1.6MM) Stainless Steel BUTTON HEAD TORX Screw
BURKLE INC Funnel, stainless steel, V2A, outer-Ø 3.94 in. (100 mm)
The rugged stainless steel filling funnel makes it easy to fill and transfer free-flowing powders, liquids and low-viscosity media. With an air vent on the discharge tube, it provides complete and unobstructed flow for efficient handling of a wide variety of materials.
The larger versions of the feed hopper are also equipped with a handle, which not only increases safety when handling larger fill quantities, but also improves usability in industrial environments.