Pressure Equalising Funnels Pear shape
Product Code : EL-F-10219
Quick answer: A pressure-equalising funnel has a side arm connecting the space above the liquid to the space below the stopcock, so pressure stays balanced between the funnel and the reaction flask as liquid is added — useful for closed-system or inert-atmosphere reagent addition. This pear-shape version has a socket top, a PTFE key stopcock, and a stem with cone, in capacities of 100ml, 250ml or 500ml and socket sizes of 19/26 or 24/29.
| Specification | Detail |
|---|---|
| Product | Pressure Equalising Funnel, Pear Shape |
| Fitting | Socket top, stem with cone |
| Stopcock type | PTFE key |
| Capacities | 100ml, 250ml, 500ml |
| Socket sizes | 19/26, 24/29 |
Why Use a Pressure-Equalising Funnel
In a sealed or inert-atmosphere set-up, adding liquid from a standard dropping funnel changes the pressure inside the reaction flask as the liquid level rises there and falls in the funnel, which can cause uneven addition or require venting that risks contaminating the atmosphere. A pressure-equalising funnel's side arm keeps the gas space above the liquid in the funnel connected to the flask, so pressure stays balanced throughout the addition without opening the system. This makes it a standard choice for air-sensitive or moisture-sensitive synthesis work carried out under nitrogen or argon. The cone-and-socket fitting lets it connect directly into a standard ground-glass joint train.
Frequently Asked Questions
What is a pressure-equalising funnel used for?
It is used to add liquid reagents into a sealed or inert-atmosphere reaction set-up without disturbing the internal pressure, common in air-sensitive synthesis work.
What socket sizes are available?
19/26 and 24/29 standard taper joint sizes.
What capacities are available?
100ml, 250ml and 500ml.
Related Products
Explore more from the Funnel range: Dropping Funnel Pear Shape PTFE Stopcock, Dropping Funnel Cylindrical, PTFE Stopcock, and the full Laboratory funnel category.
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Last updated: September 2026.
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