Description
Durham tubes in calcium soda glass with a round bottom are small inverted-insert vessels used in microbiological gas-detection and fermentation assays. Each tube provides a 0,5 ml capacity and compact dimensions of Ø 6 × H 35 mm, allowing placement inside larger culture tubes so that gas evolution can be observed as bubble accumulation in the closed end. The calcium soda glass construction offers optical clarity for reliable visual readout of gas production during carbohydrate fermentation and related metabolic tests. Packs contain 250 pieces, which suits high-throughput media preparation, teaching practicals, and routine diagnostic workflows that consume many small inserts per batch. Round-bottom geometry supports clean filling and stable seating within the outer culture tube. These Durham tubes from manufacturer Marienfeld are dimensioned for consistent handling in classical microbiology protocols. With a pack weight of 0,250 kg, the set is easy to store and dispense at the media bench. They serve as dedicated consumables wherever small-volume gas traps are required alongside standard culture tubes in laboratory glassware inventories.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 250 pc(s)
- Material: calcium soda glass
- Bottom shape: round bottom
- Capacity: 0,5 ml
- Dimensions: Ø 6 × H 35 mm
- Weight: 0,250 kg
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Questions about Durham-tubes, calcium soda glass, round bottom 0.5 ml, Ø 6 x H 35 mm
What is this article?
Durham-tubes, calcium soda glass, round bottom 0.5 ml, Ø 6 x H 35 mm 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.