Dropping Funnel Cylindrical, Needle Valve Stopcock
Product Code : EL-F-10105
Quick answer: This dropping funnel has a cylindrical body and a needle-valve stopcock for fine, dropwise control of reagent addition, available with a PE (polyethylene) stopper. It is supplied in five capacities from 50ml to 1000ml, each with a choice of 2.5mm, 4mm or 6mm bore, and is used to add a liquid reagent into a reaction vessel in a slow, controlled stream.
| Specification | Detail |
|---|---|
| Product | Dropping Funnel Cylindrical, Needle Valve Stopcock |
| Capacities offered | 50ml, 100ml, 250ml, 500ml, 1000ml |
| Stopcock type | Needle valve |
| Bore options | 2.5mm, 4mm, 6mm |
| Stopper | Available with PE (polyethylene) stopper |
Why a Needle-Valve Stopcock for Dropwise Addition
A needle-valve stopcock uses a fine tapered needle rather than a rotating key or ball to control flow, which makes it easier to hold a very slow, steady drip rate than with a standard key stopcock. This matters most in reactions where the rate of addition controls the reaction temperature or selectivity, such as exothermic additions that need to be kept slow to avoid a runaway temperature rise. The bore size chosen affects how fine that control can be — a smaller 2.5mm bore gives finer control at lower flow rates, while the 6mm bore supports faster addition when fine control matters less.
Frequently Asked Questions
What bore sizes are available for the needle valve?
This dropping funnel is offered with 2.5mm, 4mm or 6mm bore options. A smaller bore gives finer control over slow, dropwise addition; a larger bore supports faster flow when fine control is less critical.
What capacities are offered?
It is supplied in 50ml, 100ml, 250ml, 500ml and 1000ml capacities.
Does this funnel come with a stopper?
Yes, it is available with a PE (polyethylene) stopper.
Related Products
Explore more from the Funnel range: Buchner Funnel Fritted Disc, Analytical Funnel PP, and the full Laboratory funnel category.
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Last updated: September 2026.
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