Description
Test tubes in soda-lime glass with a round bottom are classic laboratory vessels for handling liquid samples, reagents, and simple reaction mixtures. Each tube offers a 35 ml working volume and external dimensions of Ø 18 × H 180 mm, giving a slender format that fits standard racks, heating blocks, and water baths used in routine analytical and teaching workflows. Optical clarity of the glass supports visual checks of colour changes, turbidity, precipitates, and phase separation during qualitative tests. Packs contain 100 pieces, making the format practical for high-throughput sample preparation, intermediate holding steps, and everyday consumable stock in quality-control and research laboratories. The round-bottom geometry aids mixing and drainage while remaining compatible with common tube holders. These tubes from manufacturer Marienfeld combine dimensional consistency with the everyday chemical resistance expected of soda-lime laboratory glassware. With a pack weight of 2,400 kg, the set is convenient for restocking teaching benches and general laboratory stores that require reliable round-bottom test tubes in a defined volume class for aqueous work and short-term sample handling.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 100 pc(s)
- Material: soda-lime glass
- Bottom shape: round bottom
- Capacity: 35 ml
- Dimensions: Ø 18 × H 180 mm
- Weight: 2,400 kg
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Questions about Test tubes, soda-lime glass, round bottom, 35 ml, Ø 18 x H 180 mm, 100 unit(s)
What is this article?
Test tubes, soda-lime glass, round bottom, 35 ml, Ø 18 x H 180 mm, 100 unit(s) is the article on this page. Luminix Health distributes Marienfeld for laboratory use. It sits in Round-bottom flasks, inside Beakers & flasks, in Labware.
A round-bottom flask is the heating flask of a distillation or a reflux. The curved wall takes the heat, and the ground neck connects to a still head or a condenser. The joint size, not only the volume, has to match the rest of the set.
A beaker is an open working vessel: easy to pour, poor as a measure. An Erlenmeyer flask has a flat base and a conical wall so a liquid can be swirled without climbing out. A round-bottom flask is for heating under a condenser, because the heat meets a curved wall and the joint at the neck connects to the rest of the glassware. Borosilicate is the glass that survives the temperature change. These forms are listed under ISO laboratory glassware.
Which category should I open next?
The category is Beakers & flasks. The sub-category is Round-bottom flasks. The catalogue is Labware.
Shelves beside this one are Beakers, Erlenmeyer flasks, Reaction vessels & jacketed vessels, Flat-bottom flasks, Flasks (other) and Beaker & flask accessories.
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.