Test Piece
Product Code : SCL-CL-11517
Test Piece (SKU SCL-CL-11517) is a large rimless glass test tube, 25 x 200 mm, of the size many syllabuses call a boiling tube. With its wide bore and transparent walls it is used for boiling liquids, dissolving solids, preparing gases and holding bigger samples in school, college and technician laboratories. Science Lab Supplies supplies it from Ambala, India, serving schools, colleges, training institutes, tender contractors and distributors.
Specifications
This tube is 25 mm wide and 200 mm long, the biggest of the four rimless test tube sizes listed alongside it. The straight top accepts a wide stopper, the clear glass keeps the contents visible, and the glass is described as heat resistant and chemical resistant for repeated laboratory use.
| Parameter | Value |
|---|---|
| SKU | SCL-CL-11517 |
| Item | Glass test tube (boiling tube size) |
| Size | 25 x 200 mm |
| Mouth | Rimless |
| Colour | Transparent |
| Properties | Heat resistant, chemical resistant |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the 25 x 200 mm Test Tube
A 25 x 200 mm tube is used as a boiling tube: its volume leaves space for liquids to boil without spilling and for gases to be generated through a stopper and delivery tube. It appears in CBSE/NCERT Class 9–12 practicals, B.Sc. chemistry and biology, and laboratory technician courses.
- Class 9 science: finding the boiling point of water or separating mixtures by heating.
- Class 10–12 chemistry: preparing gases such as oxygen or carbon dioxide on a small scale.
- Class 11–12 and B.Sc.: boiling a salt with water or dilute acid to prepare its solution for analysis.
- Biology practicals: enzyme activity and fermentation experiments that need a larger sample.
Standard Scope of Supply
Each piece is a single rimless glass tube of 25 x 200 mm, transparent and heat resistant as listed above. No stopper, rack or holder is included in the description; add those as separate lines and the quotation will show them together with the number of tubes per pack.
Packing, MOQ and Lead Time
Requests can be for one pack of boiling tubes or for the full stock needed by a new laboratory. Science Lab Supplies replies with a quotation giving the packing, delivery time and price for that quantity, and stoppers or racks can be priced on the same quotation.
Science Lab Supplies is a registered exporter with an Importer-Exporter Code and is able to ship to buyers in Bangladesh, Zambia, Rwanda, South Africa, Qatar and Sri Lanka. Tender bidders can start at the lab tender page; other buyers can fill the enquiry cart or write in from the contact page.
Frequently Asked Questions
Is this the same as a boiling tube?
Yes, in practice. A 25 x 200 mm tube is the size commonly used as a boiling tube, because its width and length allow liquids to be boiled with less risk of bumping over the top.
What volume of liquid should be heated in it?
Keep the liquid to roughly a quarter or a third of the tube, add an anti-bumping granule when boiling, and heat the side of the tube rather than the bottom alone.
Who supplies the 25 x 200 mm Test Piece?
Science Lab Supplies in Ambala, India is the supplier. Schools, colleges, contractors and distributors receive a direct quotation that can also cover racks, stoppers and other glassware.
Can this tube be quoted for a school tender?
Yes. Send the quantity, tender specification and delivery location, and the tube will be quoted item-wise with the size and features stated on this page.
Related Test Tubes and Fittings
Boiling tubes are normally used with stoppers for gas work, a rack for storage and a brush for cleaning, and schools often keep a smaller size for routine tests. These four Chemistry Lab items work alongside the 25 x 200 mm tube.
- Test Piece (18 x 180 mm) — mid-size tube for smaller volumes.
- Rubber Stoppers of Various Diameters with Holes — to fit a delivery tube for gas preparation.
- Stand for Cylinders (Test Tube Rack) — storage and drying on the bench.
- Brush for Washing Test Tubes — reaches the bottom of long tubes.
Browse the full Chemistry Lab range or all school lab equipment.
Last updated: 25 September 2026
