Description
Two-necked flask, DURAN®, 250 ml is a round laboratory flask designed with two ground-glass necks of different sizes for flexible multi-port setups. The centre neck is NS 24/29 and the angled side neck is NS 14/23, enabling a larger main connection for condensers or stirrer guides together with a smaller side port for addition funnels, gas inlets or sensors. Nominal capacity is 250 ml, supporting medium-scale synthesis, distillation and sample-handling tasks. The flask is offered as a single piece with a weight of 0,109 kg. Made from DURAN® glass by Lenz, it sits within the familiar category of round flasks and flasks with ground glass joints used throughout laboratory glassware assemblies. The combination of a larger centre joint and an angled smaller side neck improves apparatus layout on the bench or in heating equipment while maintaining standard NS compatibility. This configuration is practical for organic chemistry, pharmaceutical research and general laboratory workflows that require reliable two-neck vessels with mixed joint sizes.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Product type: Two-necked flask
- Capacity: 250 ml
- Centre neck: NS 24/29
- Side neck: angled NS 14/23
- Material: DURAN®
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Questions about Two-necked flask, DURAN®, 250 ml, angled side neck 14/23, centre 24/29
What is this article?
Two-necked flask, DURAN®, 250 ml, angled side neck 14/23, centre 24/29 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.