Description
Three-necked round-bottom flask, 250 ml is a versatile multi-neck reaction vessel for laboratory synthesis, reflux and distillation tasks that need concurrent connection of stirrers, condensers or dropping funnels. The flask is equipped with a centre neck NS 29/32 and two angled side necks NS 14/23, allowing stable, space-efficient apparatus layouts and reduced mechanical stress on the joints. Produced in DURAN® glass from manufacturer Lenz, it offers the thermal shock resistance and chemical durability expected in everyday preparative chemistry. The 250 ml capacity suits medium-scale reactions, intermediate isolation steps and process optimisation where clear visual monitoring of the mixture remains essential. Delivered as one piece, the vessel fits standard ground-joint glassware and supports flexible experimental configurations without extra adapters for the specified joint sizes. Its round-bottom form promotes uniform heating with mantles or baths, making it a reliable workhorse for organic, inorganic and teaching laboratory applications.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Capacity: 250 ml
- Centre neck: NS 29/32
- Side necks: NS 14/23
- Side neck configuration: Angled
- Glass type: DURAN®
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Questions about Three-necked round-bottom flask, 250 ml, Centre neck 29/32, side neck 14/23
What is this article?
Three-necked round-bottom flask, 250 ml, Centre neck 29/32, side neck 14/23 is the article on this page. Luminix Health distributes Lenz 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.