Dropping Funnel Cylindrical, PTFE Stopcock
Product Code : LSK-LF-10390
Dropping Funnel Cylindrical, PTFE Stopcock (SKU LSK-LF-10390) is a cylindrical dropping funnel fitted with a PTFE stopcock, used to feed a liquid reagent into a reaction flask at a controlled rate. Because a PTFE key runs without grease, it is a practical choice where grease could contaminate the product or a glass key might stick. It comes in five capacities, 50 mL to 1000 mL. Quotations are sent from Ambala, India by Science Lab Supplies to colleges, universities, institutes, tender contractors and distributors.
Specifications
This table sets out the bores, capacities and stopper option of the PTFE stopcock funnel. In short, it combines the cylindrical body with a PTFE stopcock in 2.5 mm, 4 mm or 6 mm bore, a PE stopper is available for the top opening, and five capacities from 50 mL to 1000 mL cover teaching-scale and preparative reactions.
| Specification | Value |
|---|---|
| SKU | LSK-LF-10390 |
| Body shape | Cylindrical |
| Stopcock type | PTFE |
| Bore options | 2.5 mm, 4 mm, 6 mm |
| Stopper | Available with PE stopper |
| Capacities | 50, 100, 250, 500, 1000 mL |
| Number of capacities | 5 |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the PTFE Stopcock Dropping Funnel
The funnel is mounted above a reaction flask so a reagent can be added gradually while the mixture is stirred, cooled or refluxed. The grease-free PTFE stopcock suits organic solvents and reactions where product purity matters, so the funnel fits college synthesis labs and pharmaceutical chemistry departments.
- B.Sc. organic chemistry: dropwise addition in preparations such as nitration of aromatic compounds, into a Round Bottom Flask, Wide Neck.
- M.Sc. and research synthesis: additions in organic solvents where grease would contaminate products.
- B.Pharm and M.Pharm medicinal chemistry: controlled addition during synthesis of drug molecules.
- Chemical engineering practicals: semi-batch feeding of a reactant, with the funnel clamped on a Laboratory Stand.
Standard Scope of Supply
Each funnel is supplied as a single unit with its PTFE stopcock, in the capacity and bore selected, and the PE stopper option is confirmed on the quotation. A reaction flask, stand and clamps can be quoted on the same enquiry if you are building a complete addition set-up.
Packing, MOQ and Lead Time
One funnel or a full bench set can be quoted, in any mix of capacities and bores. Your quotation will state packing, delivery time and price for exactly those quantities, and other chemistry lab equipment for the synthesis bench can be added to it.
Science Lab Supplies has an Importer-Exporter Code as a registered exporter and can ship to buyers in the UAE, Saudi Arabia, Oman, the Philippines, Nepal and Bangladesh. Specify capacity and bore when you write via the contact page, or line the funnels up in the enquiry cart; tendered purchases are covered on the lab tender page.
Frequently Asked Questions
Why choose a PTFE stopcock?
A PTFE key turns without grease, so there is no grease to dissolve into organic solvents or contaminate the product, and it is less likely to seize than a glass key.
What capacities and bores are offered?
Capacities of 50, 100, 250, 500 and 1000 mL are offered, and the stopcock bore can be 2.5 mm, 4 mm or 6 mm. State the combination you need for each line of your enquiry.
Who supplies the Dropping Funnel Cylindrical, PTFE Stopcock?
Each capacity and bore of this funnel is quoted as its own line by Science Lab Supplies in Ambala, India, for colleges, laboratories, contractors and distributors placing an enquiry.
How does it differ from the needle valve and solid glass versions?
All three share the cylindrical body, bores and capacities. The difference is the stopcock: PTFE here, a needle valve for fine rate control, or solid glass.
Related Funnels and Reaction Flasks
A PTFE-stopcock funnel can be paired with the same funnel in another stopcock, a pear-shaped variant, a separating funnel for the work-up and suitable flasks. The items below from the funnel range and the Laboratory Flasks range fit that workflow and can share one quotation with this funnel.
- Dropping Funnel Cylindrical, Needle Valve Stopcock — needle valve stopcock for fine drip-rate control, in the same five capacities.
- Dropping Funnel Cylindrical, Solid Glass Stopcock — solid glass stopcock version in 2.5, 4 and 6 mm bores.
- Dropping Funnel Pear Shape PTFE Stopcock — pear shape with drip stem and stem inside cone, PTFE stopcock in 2.5 or 4 mm bore.
- Pressure Equalising Funnels Pear shape — pressure-equalising pear funnel with socket and stem with cone, 100 to 500 ml.
- Separating Funnel Gilson PTFE Stopcock — Gilson separating funnel with PTFE stopcock, 50 to 2000 ml.
- Separating Funnel with PTFE Key Stopcock — PTFE key and PE stopper, printed in white enamel, 125 to 2000 ml.
- Flask Pear Shape Single Neck — borosilicate pear flask for semi-micro distillations, 25 to 200 mL.
- Round Bottom Flask, Narrow Neck — borosilicate flask with a 50 mm neck and 260 mm height.
Browse the full Laboratory funnel range, the Laboratory Flasks range, or all school lab equipment.
Last updated: 9 October 2026
