Technical Foundation
What Is a Laboratory Funnel?
Standard and powder funnels perform simple gravity transfer of liquids or solids into narrow-necked vessels, differing mainly in stem width — powder funnels use a short, wide stem to prevent clogging with granular or powdered solids. Buchner and Hirsch funnels are purpose-built for vacuum filtration: a flat, perforated plate holds filter paper and the funnel seals to a filter flask via a rubber adapter, with the vacuum pulling liquid through faster than gravity filtration alone.
Separatory funnels serve an entirely different function — liquid-liquid extraction — using a pear or cylindrical shape with a stopcock at the base to drain and separate immiscible liquid layers by density. Material selection follows the chemistry: borosilicate glass resists most solvents and heat but not hydrofluoric acid, which requires polypropylene or PTFE funnels instead, and PTFE stopcocks are specified over glass or PP stopcocks where chemical inertness with aggressive reagents is critical.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Funnel Type | Standard, powder, Buchner, Hirsch, separatory | Determines the physical transfer or separation function the funnel performs |
| Material | Borosilicate glass, polypropylene, PTFE, porcelain | Determines chemical resistance — glass fails with HF, PP/PTFE handle a broader range of aggressive reagents |
| Top Diameter | Typically 50mm-300mm | Must match the sample volume and pouring/filtration rate needed |
| Stem Length/Bore | Short-wide (powder) vs. long-narrow (standard) | Wide-bore stems prevent clogging with solids; narrow stems control liquid flow rate |
| Stopcock Type (Separatory) | PTFE, glass, or plastic stopcock | PTFE stopcocks resist sticking and chemical attack better than glass with aggressive solvents |
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Applications
Where Laboratory Funnels Get Used
Laboratory funnels are used anywhere liquids or solids need controlled transfer, filtration or phase separation in a lab setting.
Analytical & QC Laboratories
Standard and powder funnels for routine sample transfer and preparation during quality control testing.
Organic Chemistry Synthesis
Separatory funnels for liquid-liquid extraction steps in synthesis and purification workflows.
Academic Teaching Laboratories
General-purpose glass and plastic funnel sets supporting a wide range of undergraduate lab exercises.
Pharmaceutical & Materials Testing
Buchner and Hirsch funnels for vacuum filtration of precipitates and crystalline products.
Environmental & Water Testing Labs
Filter funnels supporting sample filtration ahead of analytical testing procedures.
Brands
Laboratory Funnels Brands in the Catalogue
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FAQ
Laboratory Funnels Questions, Answered
What's the difference between a Buchner funnel and a Hirsch funnel?
Both are vacuum filtration funnels with a flat, perforated plate holding filter paper, but a Buchner funnel has straight, vertical sides and is typically used for larger filtration volumes, while a Hirsch funnel has tapered, sloped sides and a smaller filtering area, suited to smaller-scale filtration where minimizing dead volume matters.
When do I need a separatory funnel instead of a standard funnel?
Separatory funnels are for liquid-liquid extraction — separating two immiscible liquid layers by density using a stopcock at the base to drain the lower layer selectively. A standard funnel only performs one-way gravity transfer and has no mechanism to separate or control the drainage of distinct liquid layers.
Why would I choose polypropylene or PTFE funnels over glass?
Borosilicate glass resists most common solvents and acids but is attacked by hydrofluoric acid and can be chipped or broken; polypropylene and PTFE funnels handle HF and a broader range of aggressive chemicals, and being unbreakable, are preferred in environments where dropped glassware is a safety or contamination concern.
What size funnel do I need for my filtration volume?
Match the funnel's top diameter to the sample volume and desired filtration speed — larger diameters filter faster because they support more filter paper surface area, but must still fit the receiving flask or vessel's neck opening; check both dimensions rather than sizing on volume alone.
Do I need a PTFE stopcock on my separatory funnel?
PTFE stopcocks resist sticking, swelling and chemical attack better than glass or standard plastic stopcocks when working with aggressive or viscous solvents, and don't require the periodic greasing a glass stopcock needs — specify PTFE where the funnel will see frequent use with harsh reagents or where consistent, grease-free operation matters.
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