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 where a glass key might stick. It comes in five capacities, 50 mL to 1000 mL. Science Lab Supplies supplies it from Ambala, India, and quotes colleges, universities, institutes, tender contractors and distributors directly.
Specifications
This version combines the cylindrical body with a PTFE stopcock, offered in 2.5 mm, 4 mm and 6 mm bores. A PE stopper is available for the top opening. Five capacities, 50, 100, 250, 500 and 1000 mL, cover teaching-scale and larger preparative reactions.
| Parameter | Value |
|---|---|
| SKU | LSK-LF-10390 |
| Body shape | Cylindrical |
| Stopcock type | PTFE |
| Bore | 2.5 mm, 4 mm, 6 mm |
| Stopper | Available with PE stopper |
| Capacities | 50, 100, 250, 500, 1000 mL |
| 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, making it common in college synthesis labs and pharmaceutical chemistry departments.
- B.Sc. organic chemistry: dropwise addition in preparations such as nitration of aromatic compounds.
- 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.
Standard Scope of Supply
Each funnel is supplied as a single unit with its PTFE stopcock, in the capacity and bore selected; the PE stopper and any other accessories are confirmed on the quotation. The reaction flask, stand and clamps are not part of the item.
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. Use the contact page to write in, or collect items in the enquiry cart; buyers working to a tender can start from 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 listed, each with a choice of 2.5 mm, 4 mm or 6 mm stopcock bore.
Who supplies the Dropping Funnel Cylindrical, PTFE Stopcock?
Science Lab Supplies, operating from Ambala, India, supplies this funnel and quotes each capacity and bore separately for colleges, laboratories, contractors and distributors.
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 Dropping Funnels
Labs that use PTFE-stopcock funnels often need the same funnel with another stopcock, a pear-shaped variant, or a separating funnel for the work-up. These four items from the funnel range fit that workflow and can share one quotation with this funnel.
- Dropping Funnel Cylindrical, Needle Valve Stopcock — needle valve for fine rate control.
- Dropping Funnel Cylindrical, Solid Glass Stopcock — the all-glass stopcock version.
- Dropping Funnel Pear Shape PTFE Stopcock — pear-shaped body with a PTFE stopcock.
- Separating Funnel Gilson PTFE Stopcock — separating funnel for the work-up stage.
Browse the full Laboratory funnel range or all school lab equipment.
Last updated: 25 September 2026
