Cork Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-5616
Jlab Export is a leading Cork Manufacturer,and suppliers in India
This Cork listing (code EL-SLE-5616) covers tapered stoppers of natural dark cork for closing glass bottles, flasks and tubes in school and college science labs, offered in four sizes: 42 mm, 45 mm, 48 mm and 50 mm. Cork is light and compressible, so a tapered cork presses into a neck and springs back to seal it, and it can be bored to take a glass tube. The corks are made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Material | Natural cork, dark |
| Shape | Tapered stopper |
| Use | Stoppers for glass vessels |
| Sizes listed | 42 mm, 45 mm, 48 mm and 50 mm (the listing does not say which dimension — confirm the top and bottom diameter in your enquiry) |
| Quality check | Each cork is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-5616 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Stoppers?
| Listing | Material | Details given on its page |
|---|---|---|
| These corks (EL-SLE-5616) | Natural dark cork | Tapered; 42, 45, 48 and 50 mm sizes |
| Cork Stopper | Natural bark | Tapered; brown |
| Wooden Cork Stoppers | Wooden cork | Different sizes; for test tubes, narrow-mouth bottles and beakers |
| Rubber Corks (with Two Holes) | Rubber | Bored twice for two glass tubes in one sealed mouth |
Choose these natural corks for general closing of glassware with wide necks in the listed sizes. Rubber stoppers seal more tightly and stand up better to acids and alkalis, and the two-hole rubber cork is ready-bored for gas preparation set-ups.
What Are Laboratory Corks Used For?
Corks close reagent bottles, flasks, boiling tubes and specimen jars, and a bored cork holds a thermometer, glass tube or thistle funnel in apparatus built for school practicals. Measure the neck before ordering: a tapered cork should enter the neck by about a third to half its length. Bore holes with a sharp cork borer slightly smaller than the tube, turning it gently from both ends, and ease the tube in with a little water or glycerine while holding it close to the cork. Cork is porous and is attacked by strong acids, alkalis and oxidising agents, so use rubber or glass stoppers for those; store spare corks dry.
Frequently Asked Questions
Which sizes are available?
Four: 42 mm, 45 mm, 48 mm and 50 mm. The listing does not say which dimension these figures refer to, so give the inside diameter of the neck you need to close and JLab will confirm the matching size.
Are these corks or rubber stoppers?
The listing describes natural dark cork, tapered. JLab lists rubber corks separately, including a two-hole version, compared above.
Can holes be made in these corks?
Yes, with a cork borer. Bore slightly undersize, from both ends if needed, so that the glass tube or thermometer fits tightly.
Who makes these corks?
Jain Laboratory Instruments Pvt Ltd (JLab) produces 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 maker of school lab equipment and laboratory accessories in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. These corks come from JLab’s own works rather than a trading house, so schools, colleges, dealers and importers buy them factory-direct, each cork is checked by eye before packing, and repeat orders are handled by the manufacturer. The company is registered under CIN U29309HR2017PTC069123 and holds MSME Udyam registration UDYAM-HR-01-0003849 as a manufacturing enterprise. JLab exports worldwide and ships to buyers in every region — for example Liberia in West Africa, Austria in Western Europe, Malawi in East Africa, Mexico in North America and Vietnam in Southeast Asia.
Cork Tools and Glassware
- Cork Borer Set — chrome-plated brass borers with handles and cleaning rods for boring holes in corks and rubber stoppers.
- Reagent Bottles — wide-mouth borosilicate bottles for stock solutions.
- Distilling Flasks — round-bottom, long-neck flasks that take a bored cork and thermometer.
- Test Tubes Borosilicate — rimmed borosilicate test tubes in several capacities.
See more in the School Lab Equipment range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the sizes and quantity (minimum 10 units), the neck diameter of the vessels you need to close and your delivery location through the contact page.
Last updated: 4 October 2026
