Dropping Funnel Cylindrical, Needle Valve Stopcock
Product Code : LSK-LF-10389
Dropping Funnel Cylindrical, Needle Valve Stopcock (SKU LSK-LF-10389) is a cylindrical addition funnel whose outlet is controlled by a needle valve, giving fine, repeatable control of the drip rate when a reagent is added slowly to a reaction. It is offered in capacities from 50 mL to 1000 mL with three bore sizes. Organic chemistry labs in colleges, universities and pharmacy institutes use it in synthesis practicals. Supply to colleges, institutes, tender contractors and distributors is handled by Science Lab Supplies from Ambala, India.
Specifications
The funnel has a cylindrical body and a needle valve stopcock, available with bores of 2.5 mm, 4 mm or 6 mm. It can be supplied with a PE stopper for the top, and five capacities are listed, from 50 mL up to 1000 mL, to suit small and larger reaction set-ups.
| Parameter | Value |
|---|---|
| SKU | LSK-LF-10389 |
| Body shape | Cylindrical |
| Stopcock type | Needle valve |
| 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 Needle Valve Dropping Funnel
A dropping funnel sits on a reaction flask and releases a liquid reagent drop by drop, so that exothermic or fast reactions stay under control. The needle valve lets the operator set a slow, steady rate and leave it, which is useful for long additions in synthesis and pharmaceutical chemistry labs.
- B.Sc. and M.Sc. organic chemistry: slow addition of reagents during nitration, bromination and similar preparations.
- B.Pharm pharmaceutical chemistry: dropwise addition in the synthesis of drug intermediates.
- Research labs: controlled-rate addition over long periods.
- Chemical engineering labs: feeding a reactant steadily into a batch reactor flask.
Standard Scope of Supply
The funnel is supplied as a single unit with its needle valve stopcock, in the capacity and bore you specify; the PE stopper option and any other accessories are confirmed on the quotation. Reaction flasks, clamps and stands are separate items.
Packing, MOQ and Lead Time
Ask for a quote for one dropping funnel or for enough to equip each synthesis bench. The quotation from Science Lab Supplies confirms packing, delivery time and price for that number, and flasks or other chemistry lab equipment can be quoted together.
With its Importer-Exporter Code, Science Lab Supplies is a registered exporter and can ship to buyers in Uganda, the UAE, Saudi Arabia, Oman, the Philippines and Nepal. Reach us on the contact page or through the enquiry cart, and look at the lab tender page when a tender is involved.
Frequently Asked Questions
What does the needle valve add over a standard stopcock?
A needle valve opens gradually, so the flow can be set precisely and held at a steady drip. That makes slow, controlled additions easier than with a simple on/off key.
Which bore should I choose?
The 2.5 mm bore suits fine dropwise additions, 4 mm is a general choice, and 6 mm allows faster flow for larger volumes or more viscous liquids.
Who supplies the Dropping Funnel Cylindrical, Needle Valve Stopcock?
It is supplied by Science Lab Supplies, which dispatches from Ambala, India and quotes colleges, research labs, contractors and distributors by capacity and bore.
Is a stopper included?
The funnel is available with a PE stopper. Mention it in your enquiry and the quotation will show whether it is included for the capacity you choose.
Related Dropping and Separating Funnels
Synthesis labs often keep dropping funnels with different stopcocks and shapes, chosen by reagent and flow needs. The four items below from the funnel range offer those alternatives and can be quoted alongside the needle valve model.
- Dropping Funnel Cylindrical, PTFE Stopcock — same body with a PTFE stopcock.
- Dropping Funnel Cylindrical, Solid Glass Stopcock — same body with a solid glass stopcock.
- Pressure Equalising Funnels Pear shape — pear-shaped pressure-equalising funnel.
- Separating Funnel Cylindrical — cylindrical funnel for separating liquids.
Browse the full Laboratory funnel range or all school lab equipment.
Last updated: 25 September 2026
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