Rubber Stoppers of Various Diameters Without Holes

Product Code : SCL-CL-11547

Rubber Stoppers of Various Diameters Without Holes (SKU SCL-CL-11547) are solid, round rubber bungs used to seal test tubes, small flasks and bottles so that contents do not spill, evaporate or pick up contamination. Every chemistry and biology bench uses them, from school practical rooms to college and testing laboratories. Science Lab Supplies, working from Ambala, India, puts them on quotations for schools, colleges, training institutes, tender contractors and distributors.

Specifications

Made from chemical-resistant rubber, these round stoppers have no bore, so they close a vessel completely. They are offered in bottom diameters of 11 mm, 13 mm, 14 mm and 15 mm, sizes that match the mouths of common test tubes and small-necked glassware used in teaching labs.

Applications and Experiments for the Rubber Stoppers Without Holes

Solid stoppers are used whenever a tube or flask must be closed tight: shaking a mixture, storing a prepared sample, keeping a gas inside a tube until it is tested, or sealing a culture. They are consumable items that schools restock every year for chemistry and biology practicals.

• Class 6–10 science: shaking solutions and suspensions in closed test tubes.
• Class 11–12 chemistry: storing and carrying collected gases and prepared samples between benches.
• Biology practicals: closing tubes during germination, enzyme and fermentation experiments.
• College and testing labs: temporary sealing of small flasks and sample tubes.

Standard Scope of Supply

These solid stoppers are supplied in the bottom diameters 11 mm, 13 mm, 14 mm and 15 mm. Specify the sizes and the quantity of each, and the quotation will confirm the mix and how they are packed. Tubes and flasks are ordered separately.

Packing, MOQ and Lead Time

Whether you need a few dozen for one class or a yearly restock for several labs, ask for a quotation; it will show packing, delivery time and price for your exact quantities. Holed stoppers, flasks and test tubes can be included on the same document.

Registered as an exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Peru, Egypt, Iraq, Nigeria, Kenya and Ghana. Enquiries are welcome through the contact page and the enquiry cart, and larger programmes can start from the lab tender page.

Frequently Asked Questions

How do I choose the right stopper size?
Compare the inner diameter of the tube or flask mouth with the bottom diameters on offer: 11 mm, 13 mm, 14 mm and 15 mm. The stopper should enter part-way and seal firmly.

How are these different from holed stoppers?
These are solid and seal the vessel completely. Holed stoppers are bored to take a delivery tube or thermometer.

Who supplies the Rubber Stoppers of Various Diameters Without Holes?
They are supplied by Science Lab Supplies from Ambala, India, directly to schools, colleges, dealers and tender contractors.

Are they resistant to laboratory chemicals?
The rubber is described as chemical resistant, suited to routine aqueous reagents. For strong solvents or oxidising acids, check with us before use.

Related Stoppers and Glassware

Solid stoppers are bought with the vessels they close and with holed stoppers for set-ups that need an outlet. The four Chemistry Lab items below cover both, plus a rack to stand stoppered tubes, so glassware and closures can be matched on one quotation.

• Rubber Stoppers of Various Diameters with Holes — bored version for delivery tubes.
• Flat-Bottomed Flasks 100ml — small flasks to seal and store.
• Conical Pot (Erlenmeyer) 250ml — conical flask for mixing and storage.
• Case Holder — 12-hole wooden rack for stoppered tubes.

Browse the full Chemistry Lab range or all school lab equipment.

Last updated: 25 September 2026