Description
Flat-bottom flask 250 ml with standard ground joint is a versatile laboratory vessel designed for heating, synthesis and sample-preparation tasks that require a stable standing surface. Produced from borosilicate glass 3.3, it combines high chemical resistance with good thermal-shock performance and meets the dimensional and quality requirements of DIN EN ISO 4797. The flask incorporates a short neck finished with a standard ground-joint socket NS 29/32, ensuring leak-tight, interchangeable connections to common laboratory glassware such as condensers and dropping funnels. Its 250 ml nominal capacity is well suited to medium-scale reflux, distillation, extraction and concentration procedures carried out on hotplates or heating mantles. The flat base affords secure placement on laboratory benches and heating equipment, while the short-neck design simplifies filling, emptying and cleaning. Packed ten pieces per carton from manufacturer Marienfeld, these flasks support efficient, reproducible work in research, teaching and analytical laboratories. The transparent borosilicate construction allows continuous visual monitoring of reaction progress and liquid levels under thermal or chemical stress.
This article is part of Flat-bottom flasks, in Beakers & flasks.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 250 ml
- Joint size: NS 29/32
- Material: Borosilicate glass 3.3
- Standard: DIN EN ISO 4797
- EAN: 4250317311672
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Questions about Boiling flasks 250 ml with round bottom and ground joint
What is this article?
Boiling flasks 250 ml with round bottom and ground joint is the article on this page. Luminix Health distributes Marienfeld for laboratory use. It sits in Flat-bottom flasks, inside Beakers & flasks, in Labware.
A flat-bottom flask stands on the bench without a cork ring, which a round-bottom flask will not do. It is for heating on a plate and for simple setups. It is a poorer shape than a round bottom for even boiling under vacuum.
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 Flat-bottom flasks. The catalogue is Labware.
Shelves beside this one are Round-bottom flasks, Beakers, Erlenmeyer flasks, Reaction vessels & jacketed vessels, 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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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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.