Round Bottom Flask, Narrow Neck
Product Code : LSK-LF-10428
Round Bottom Flask, Narrow Neck (SKU LSK-LF-10428) is a borosilicate glass flask with a spherical base and a narrow neck finished with a rim, used for heating and boiling liquids evenly. The listed size has a 166 mm base diameter, a 50 mm neck diameter and a height of 260 mm. School and college chemistry labs use it with bungs, stands and heating mantles. Science Lab Supplies supplies it from Ambala, India, serving schools, colleges, tender contractors and distributors.
Specifications
The rounded bottom spreads heat evenly and resists the stress of boiling better than a flat base, while the rimmed narrow neck takes a bored bung for a thermometer, delivery tube or condenser. The flask is made of borosilicate glass and stands 260 mm high.
| Parameter | Value |
|---|---|
| SKU | LSK-LF-10428 |
| Glass | Borosilicate |
| Neck | Narrow neck with rim |
| Base diameter | 166 mm |
| Neck diameter | 50 mm |
| Height | 260 mm |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Round Bottom Flask
A round bottom flask is used wherever a liquid must be heated or boiled evenly, from preparing gases and distilling liquids to classroom demonstrations. As school chemistry lab equipment in India it appears in many secondary and senior-secondary practicals, and it remains a workhorse in college labs.
- Class 9–10 science: heating and boiling demonstrations and simple distillation set-ups.
- Class 11–12 chemistry: laboratory preparation of gases and demonstrations such as the fountain experiment.
- B.Sc. chemistry practicals: reflux and distillation with bung-fitted condensers.
Support the flask in a ring, cork ring or clamp at all times, since its rounded base cannot stand on its own, and heat it gradually through wire gauze or in a mantle.
Standard Scope of Supply
The Round Bottom Flask, Narrow Neck is supplied as a single unit as described above. Bungs, cork rings, clamps and heating mantles are separate items; any optional accessories you want are listed on the quotation.
Packing, MOQ and Lead Time
Request one flask for a demonstration table or a full quantity for a practical lab; the quotation gives packing, delivery time and price to match. Other borosilicate laboratory glassware in India, such as the wide-neck version or distillation flasks, can join the same quotation.
As a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Nigeria, Kenya, Ghana, Ethiopia, Tanzania and Uganda. Science Lab Supplies is registered for GST (GSTIN 06ADEPJ0574F2ZU). Enquiries go through the enquiry cart or the contact page, and school or college tenders are covered on the lab tender page.
Frequently Asked Questions
What are the dimensions of this flask?
The listed flask has a base diameter of 166 mm, a neck diameter of 50 mm and an overall height of 260 mm.
Why use a round bottom instead of a flat bottom flask?
A round bottom heats evenly and handles the stresses of boiling better than a flat base, which is why it is chosen for heating, reflux and distillation.
How is it closed or connected?
The narrow neck has a rim and no ground joint, so it is closed with a bung, often bored to carry a thermometer, delivery tube or condenser.
Who supplies the Round Bottom Flask, Narrow Neck?
Science Lab Supplies supplies it from Ambala, India, for schools, colleges and tender orders.
Related Laboratory Flasks
These flasks from the same range cover a wider neck, side-arm distillation, small-volume work and titration, so a school or college chemistry lab can put its everyday flasks on a single quotation.
- Round Bottom Flask, Wide Neck — beaded-rim version for mixing and boiling.
- Distillation Flask — flask with a 7 mm or 9 mm side arm for simple distillation.
- Flask Pear Shape Single Neck — for semi-micro distillation.
- Conical Flask — stoppered flask for titration and mixing.
Browse the full laboratory flasks range or all school lab equipment.
Last updated: 25 September 2026
