Laboratory funnels: how can liquids and solids be transferred cleanly?

A bench essential, the laboratory funnel ensures clean, precise transfer of liquids or powders, from the reagent bottle to the collection container. Available in plastic for versatility, borosilicate glass for chemical and thermal inertness, or as a safety funnel for solvent and waste handling, it makes every handling step safer. With ribbed stems, anti-drip rims and appropriately sized diameters, it minimises splashes, emissions and product loss. Choosing the right material–shape combination optimises your workflows, from the cleanroom to quality control.

What are the different types of laboratory funnels, and how do you choose the right one?

Three families cover the essentials.

• Plastic funnels (PP, PE, sometimes PTFE): lightweight, robust and cost-effective, ideal for routine use. PP offers good chemical resistance and withstands autoclaving at 121 °C. PE-HD is highly mechanically resistant but less suited to high temperatures. PTFE versions handle very aggressive solvents. Short or long stems, sometimes ribbed to vent air and speed up flow.

• Glass funnels (borosilicate glass): excellent inertness, transparency and thermal stability. Recommended for sensitive analyses, hot acids/bases, or where the absence of extractables is critical. Polished rim, long neck and smooth walls promote steady flow and easy cleaning.

• Safety funnels: designed for solvent transfer and waste collection. Lockable lid, controlled venting and a flame arrester limit vapours and ignition risks. Compatible with cans and drums via threaded adapters, they reduce odours, splashes and overfilling.

Type	Principle	Applications
Plastic (PP/PE, PTFE)	Lightweight, durable; PP autoclave-safe, PTFE ultra-inert	Routine transfers, aqueous media, some solvents
Borosilicate glass	Inert and transparent; thermal resistance	Sensitive analyses, hot acids/bases
Safety funnel	Lid, vent, flame arrester	Solvents, safe waste collection

In which fields is a laboratory funnel used?

• Life sciences: preparation of buffers, rehydration of media, transferring lysates without contamination.
• Agri-food: aliquoting oils, flavours, additives and fine powders; minimising product loss.
• Pharmaceutical & cosmetics: formulation, transferring excipients and active ingredients (APIs) under quality requirements with controlled cleaning.
• Environment: sample transfer, collection of solvents/waste with safety funnels to minimise emissions.
• Chemistry: synthesis, quenching, filling bench-scale reactors; material selection guided by chemical compatibility.
• Quality control laboratories: assays, preparation of standards, gravity filtration with filter paper in the appropriate funnel.

Available laboratory funnel types

Frequently asked questions about laboratory funnels

Plastic or glass: how to choose?
PP is versatile and lightweight; borosilicate glass provides chemical inertness and thermal stability for sensitive analyses. Base your choice on chemistry, temperature and cleaning.

Is a safety funnel necessary for solvents?
Yes, it minimises vapours, splashes and ignition risk thanks to its lid, vent and flame arrester. Check your COSHH/HSE requirements and local regulations.

Is PP autoclavable?
Yes, up to 121 °C. HDPE is generally not recommended. Glass and PTFE tolerate heat better; always check the limits specified by the manufacturer.

Which diameter and which stem should you choose?
Match the Ø to the container neck. Long stem for deep bottles; a ribbed stem vents air and speeds the flow of viscous liquids.

Chemical compatibility: simple rules?
PTFE/glass for strong solvents; PP for aqueous solutions; avoid strong oxidisers with certain plastics. Consult a compatibility chart.

Care and decontamination?
Neutral detergent, thorough rinse, rack dry. No flame on plastics; inspect for cracks or wear and replace if needed.

Filtering with a standard funnel, possible?
Yes, with cone-folded filter paper for gravity filtration. For vacuum filtration, choose a Büchner or a dedicated Hirsch funnel.