Stoppers
Product Code : SCL-CL-11896
Stoppers (SKU SCL-CL-11896) are solid red rubber laboratory stoppers with a tapered body, offered in sizes from 3 mm to 20 mm so that each one fits the neck or mouth of a test tube, flask or bottle. They suit school, college and technician-training labs wherever glassware must be closed during practicals or storage. From its base in Ambala, India, Science Lab Supplies can quote these plugs for school laboratories, colleges, institutes, tender contractors and resellers.
Specifications
The table below gives one row for each detail of these red rubber stoppers. In short, every plug is solid rubber with standardized tapered sides, so it wedges into a glass opening and seals it, and the 3 mm to 20 mm range covers narrow test tubes as well as wider flasks and reagent bottles.
| Specification | Value |
|---|---|
| SKU | SCL-CL-11896 |
| Material | Rubber |
| Type | Solid stopper (no hole) |
| Colour | Red |
| Size range | 3 mm to 20 mm |
| Shape | Standardized tapered sizes for different neck and mouth diameters |
| Fits | Test tubes, flasks, bottles and other laboratory glassware |
| Function | Helps prevent evaporation, leakage and contamination of samples |
| Application | Secure temporary sealing in chemistry, school and general scientific laboratories |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Laboratory Stoppers
Laboratory stoppers close glassware so that a sample or reagent does not evaporate, leak or pick up contamination between steps. They suit CBSE/NCERT chemistry and biology practicals, B.Sc. chemistry labs and laboratory-technician training, wherever a tube or flask has to be shaken, stored or set aside for a while.
- Class 9–10 chemistry: closing one of the Test Tubes while a mixture inside is shaken.
- Class 11–12 practicals: sealing Flat-Bottomed Flasks 250ml or other flasks of prepared solutions between sessions.
- Reagent storage: keeping bottles closed against evaporation and contamination.
- B.Sc. and technician training: temporary sealing of Round Bottom Pots (Spherical Flasks) during mixing or sample transfer.
Standard Scope of Supply
The Stoppers are supplied as solid red rubber plugs within the 3 mm to 20 mm size range shown above. State which sizes, and how many of each, you need when you enquire, and the quotation will confirm the assortment. Test tubes, flasks and bottles to go with them can be added to the same quotation.
Packing, MOQ and Lead Time
A quotation can cover a small pack for one bench or a full assortment for a school or college chemistry lab, and it sets out the packing, delivery time and price for the quantities you request. Matching flasks, tubes or a metal stopper file can be listed on the same quote.
Holding an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Sri Lanka, Vietnam, Malaysia, Peru, Egypt and Iraq. Science Lab Supplies is registered for GST (GSTIN 06ADEPJ0574F2ZU). Need a size assortment priced? Send a list of the glassware openings via the contact page, collect the sizes you want in the enquiry cart, or open the lab tender page if the stoppers form part of a tender.
Frequently Asked Questions
What sizes do the rubber stoppers come in?
The range runs from 3 mm to 20 mm in standardized tapered sizes, so different stoppers fit the openings of test tubes, flasks and bottles. List the glassware you need to close and the quotation will set out matching sizes.
Why close glassware with a stopper?
A stopper limits evaporation, prevents leakage when a tube is shaken, and keeps dust and other contamination away from a sample while it waits for the next step of a practical.
Do these stoppers have holes?
No. They are solid stoppers for closing glassware. If a glass tube or thermometer has to pass through the plug, choose the bored rubber stoppers in the related list below.
Who supplies the Stoppers?
The stoppers come from Science Lab Supplies in Ambala, India, which handles them within its school chemistry lab equipment in India range and can price a single small pack or a bulk assortment for an institution or distributor.
Related Stoppers, Tubes and Stoppered Glassware
Stoppers work alongside the glassware they close, and some set-ups need bored plugs or a way to reshape a hole. These Chemistry Lab items cover stoppers with and without holes, a stopper file, stoppered tubes and flasks, and a tube rack, so any of them can join this assortment on one enquiry.
- Rubber Stoppers of Various Diameters with Holes — round rubber stoppers with a hole, in bottom diameters of 11, 13, 14 and 15 mm.
- Rubber Stoppers of Various Diameters Without Holes — chemical-resistant round rubber plugs without a hole, 11 mm to 15 mm at the base.
- Metal File for Rubber Stoppers — handle with six removable heads from 3 mm to 20 mm for working rubber stoppers.
- Conical Flask (Erlenmeyer) with Stopper — glass flask from 25 ml to 500 ml with a ground glass fixed stopper.
- Tube with Stopper — high-transparency plastic tube, 15 x 100 mm, for sample handling.
- Graduated (Measuring) Tubes with Stoppers — glass measuring tubes in 10 ml and 25 ml capacities.
- Stand for Cylinders (Test Tube Rack) — rack for 12 tubes with end plates and rectangular lifting handles.
Browse the full Chemistry Lab range, the Lab Glassware range, or all school lab equipment.
Last updated: 9 October 2026
