Description
Flat-bottom flask, narrow neck, 250 ml, DURAN® is a standing laboratory flask made from borosilicate glass 3.3 for routine heating, mixing and storage work on the bench. The narrow-neck (Enghals) design with beaded rim supports secure stoppering and controlled pouring while the flat base gives stable placement on hotplates, stirrers and work surfaces. Nominal volume is 0,25 l; external body diameter is 85 mm, overall height 138 mm and neck outer diameter 34 mm, dimensions that suit standard clamps, rings and heating blocks. Manufactured from DURAN® glass and supplied by Witeg, the flask combines the thermal-shock resistance and chemical durability expected of borosilicate 3.3 laboratory ware. Net weight is 0,104 kg per piece. Offered in packs of 10 pc(s), these flat-bottom flasks are practical for sample preparation, reagent holding, gentle boiling and general wet-chemistry workflows where a stable, narrow-neck vessel is preferred. Clear geometry and consistent wall quality support reproducible handling across teaching, quality-control and research laboratories that rely on classic DURAN® glassware formats.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 0,25 l
- Material: Borosilicate glass 3.3
- Brand: DURAN®
- Neck type: Narrow neck (Enghals)
- Dimensions: Ø 85 mm × H 138 mm, neck A.Ø 34 mm
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Questions about Flasks, flat bottom, narrow neck, 250 ml
What is this article?
Flasks, flat bottom, narrow neck, 250 ml is the article on this page. Luminix Health distributes Witeg 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?
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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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.