Rubber Corks (without Holes) Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4717
Jlab Export is a leading Rubber Corks (without Holes) Manufacturer,and suppliers in India
Rubber Corks (without Holes) (code EL-SLE-4717) are solid rubber stoppers for closing test tubes, 24 mm boiling tubes and 250 ml flasks in school and college science labs. They come in sizes No. 2, 7 and 13 and are packed one hundred to a pack, so a class set lasts through many practicals. They are made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Solid rubber cork (stopper) with no hole |
| Sizes | No. 2, No. 7 and No. 13 |
| Material | Rubber |
| Designed for | Test tubes, 24 mm boiling tubes and 250 ml flasks |
| Quality check | Each pack is visually inspected before dispatch |
| Pack quantity | Pack of 100 corks |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4717 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Rubber Corks?
| Item | Holes | Sizes and use as listed | Pack |
|---|---|---|---|
| These corks (EL-SLE-4717) | None (solid) | No. 2, 7 and 13; test tubes, 24 mm boiling tubes, 250 ml flasks | Pack of one hundred |
| Rubber Corks (with One Hole) | One | No. 2, 7 and 13; same vessels | Pack of one hundred |
| Rubber Corks (with Two Holes) | Two | No. 2, 7 and 13; same vessels | Pack of one hundred |
| Rubber Corks / Rubber Stopper | Solid, one or two holes | Different sizes for glass or plastic test tubes and Erlenmeyer flasks; low-sulphur rubber | Not stated |
Choose these solid corks when a tube or flask simply has to be closed. Pick the one-hole corks to fit a thermometer or a single delivery tube, the two-hole corks for a thistle funnel plus delivery tube or an inlet and outlet, and the chemistry-range stoppers when you need sizes other than No. 2, 7 and 13.
What Are Solid Rubber Corks Used For?
A solid rubber cork closes a test tube, boiling tube or flask so that students can shake a mixture without spilling it, keep a prepared solution or sample covered between lessons, or stop dust and moisture getting into a clean vessel. In school science practicals they appear in experiments on solutions and suspensions, in biology set-ups that need a closed tube, and simply as stoppers for the class set of test tubes. Because the cork is solid, a lab technician can also bore it with a cork borer to take a glass tube of the exact diameter needed.
Push the cork in with a gentle twisting movement rather than forcing it straight down, and never stopper a tube or flask that is being heated, because the pressure inside can blow the cork out or crack the glass. Rubber softens and swells in many organic solvents, so these stoppers are intended mainly for aqueous solutions. Rinse and dry the corks after use and store them away from heat and direct sunlight so the rubber does not harden or crack.
What to Specify When Ordering
- Cork number and vessel — No. 2, 7 or 13, or tell JLab the tube or flask (test tube, 24 mm boiling tube, 250 ml flask) you need to close.
- Number of packs — each unit is a pack of 100 corks and the minimum order is 10 units; say whether you want each pack in a single size.
- Holed versions — add one-hole or two-hole corks to the same order if your set-ups need glass tubing or a thermometer.
- Cork borer — include one if you plan to bore your own holes in the solid corks.
Frequently Asked Questions
Which sizes are available?
Sizes No. 2, 7 and 13. The listing states that the corks are designed for test tubes, 24 mm boiling tubes and 250 ml flasks, but it does not pair each number with a vessel, so give your tube or flask size and JLab will confirm the right cork.
How many corks are in a pack?
One hundred. The listing does not say whether a pack holds one size or a mix, so state the size split you want when you order.
Can I make holes in these corks myself?
Yes. A solid rubber cork can be bored with a cork borer of the right diameter; wetting the borer with water or glycerine makes the cut cleaner. If you need many holed corks, the ready-made one-hole and two-hole versions save time.
Can a stoppered test tube be heated?
No. Never heat a closed tube or flask, because the trapped air and vapour expand and can push the cork out or break the glass. Remove the cork before heating and replace it after the vessel has cooled.
Are rubber corks suitable for organic solvents?
They are intended mainly for water-based solutions. Many organic solvents make rubber swell or soften, so check with your teacher or lab manual before using these corks on solvent bottles.
What should an export enquiry include?
The number of packs and sizes, the destination country and port or city, your preferred delivery terms (for example FOB or CIF), any packing or labelling instructions, and the tender reference if you are buying against a tender.
Who manufactures these corks?
JLab, the trading name of Jain Laboratory Instruments Pvt Ltd, makes them at its works in Ambala, Haryana, India, and quotes for them directly as the manufacturer.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a manufacturer of school laboratory equipment and lab consumables in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. These rubber corks come from JLab’s own works rather than a trader, so schools, colleges, dealers and importers buy them factory-direct, each pack is visually checked before dispatch, and repeat orders are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Ethiopia in East Africa, Serbia in Southern Europe, the Maldives in South Asia, Turkey in the Middle East and Switzerland in Western Europe. Bulk school lab equipment supply against tenders is covered on the JLab lab tenders page.
Related Corks and Tube Accessories
- Rubber Corks (with One Hole) — the same No. 2, 7 and 13 sizes with one hole, for a thermometer or delivery tube.
- Rubber Corks (with Two Holes) — two holes for gas-preparation and inlet–outlet set-ups.
- Rubber Corks / Rubber Stopper — the chemistry-range stoppers in solid, one-hole and two-hole forms and different sizes.
- Cork Borer (Brass) — brass borers for making uniform holes in rubber stoppers and corks to insert glass tubes.
- Test Tube Borosilicate Glass — glass test tubes in various capacities to pair with the corks.
Browse the full School Lab Equipment range for more school lab consumables.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the number of packs (minimum 10), the cork sizes or the tubes and flasks they must fit, any holed corks or cork borers you also need, and your delivery location through the contact page.
Last updated: 4 October 2026
