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. Supply is handled by Science Lab Supplies from Ambala, India, for schools, colleges, training institutes, tender contractors and distributors.

Specifications

Single facts about the 25 x 200 mm tube are tabulated below. In short, this tube is 25 mm wide and 200 mm long, the widest and longest of the four rimless sizes in this range; the straight top accepts a wide stopper, the clear glass keeps the contents visible, and the glass is heat resistant and chemical resistant.

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 over a Laboratory Spirit Burner 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, held at temperature in a Water bath, 7 L.

Standard Scope of Supply

Each piece is a single rimless glass tube of 25 x 200 mm, transparent and heat resistant as set out above. No stopper, rack or holder is included; 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. Boiling tubes join the rest of your list once added to the enquiry cart; questions go through the contact page, and the lab tender page covers public procurement.

Frequently Asked Questions

Is this the same as a boiling tube?
Yes, in practice. Many syllabuses call a tube of this 25 x 200 mm size 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 quotes it directly to schools, colleges, contractors and distributors, and the same quotation can also cover racks, holders, stoppers and other glassware for the bench.

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, Stands and Holders

Boiling tubes need a rack or stand for storage, a holder for heating and a brush for cleaning, and a smaller size suits routine tests. These Chemistry Lab and Clinical Laboratory items work alongside the 25 x 200 mm tube and can be priced on the same quotation.

• Test Piece (18 x 180 mm) — 18 x 180 mm transparent rimless tube, the next size down.
• Test Piece (12 x 100 mm) — 12 x 100 mm rimless glass tube for drop-scale tests.
• Stand for Cylinders (Test Tube Rack) — 12-place rack with smaller bottom wells that support the tube tips.
• Laboratory Apparatus Test Tube Stand — polypropylene stand with 24 wells for tubes up to 25 mm, plus drying pins.
• Test Tube Holder with Handle — self-closing nickel-plated clamp, 180 mm long, for 12–25 mm tubes.
• Test Tube Brush lab — 8-inch brush with nylon bristles on a twisted steel-wire handle.
• Vortex Test Tube — single-tube shaker with a rubber cavity for tubes up to 30 mm, up to 3200 rpm.

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

Last updated: 9 October 2026