Dropping Funnel Cylindrical, PTFE Stopcock
Product Code : EL-F-10106
Quick answer: This dropping funnel has a cylindrical body and a PTFE key stopcock, 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, PTFE Stopcock |
| Capacities offered | 50ml, 100ml, 250ml, 500ml, 1000ml |
| Stopcock type | PTFE |
| Bore options | 2.5mm, 4mm, 6mm |
| Stopper | Available with PE (polyethylene) stopper |
Why a PTFE Stopcock Is a Practical Default
A PTFE key stopcock is a practical default for a dropping funnel because it needs little maintenance and resists most common solvents and reagents used during reagent addition, without the periodic greasing a ground-glass key needs. It gives reliable on/off control and moderate flow adjustment, which suits most routine reagent-addition tasks; where very slow, fine dropwise control is the priority, a needle-valve stopcock is worth considering instead. The bore size chosen sets the funnel's practical flow range independent of the stopcock type.
Frequently Asked Questions
Why choose a PTFE stopcock over a glass key?
PTFE needs little maintenance and resists most common solvents and reagents, without the periodic greasing that a ground-glass stopcock key needs.
What bore sizes and capacities are available?
This dropping funnel is offered in 50ml, 100ml, 250ml, 500ml and 1000ml capacities, each with a choice of 2.5mm, 4mm or 6mm bore.
Does this funnel come with a stopper?
Yes, it is available with a PE (polyethylene) stopper.
Related Products
Explore more from the Funnel range: Dropping Funnel Cylindrical, Needle Valve Stopcock, Buchner Funnel Fritted Disc, and the full Laboratory funnel category.
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Last updated: September 2026.
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