Description
Two-necked pear-shaped flask, 250 ml, DURAN® offers increased capacity for preparative work that still benefits from a dual-neck pear geometry. Centre and side necks are both NS 14/23, enabling straightforward connection of matched condensers, dropping funnels, gas inlets or thermometers within a single compact vessel. The pear-shaped form keeps the liquid inventory low in the flask, supporting efficient stirring and heat exchange during larger refluxes, solvent removals and multi-step procedures. This DURAN® laboratory flask from Lenz is aimed at synthetic chemistry, process development and teaching environments that require reliable jointed glassware at the 250 ml scale. Delivered as one piece with a stated weight of 1,380 kg, it slots into standard NS 14/23 apparatus trains. Uniform joint sizing on both necks simplifies modular setup and interchange with other NS 14/23 components without additional adapters.
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
- Material: DURAN®
- Centre neck: NS 14/23
- Side neck: NS 14/23
- Design: Two-necked pear-shaped
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Questions about Two-necked pear shaped fl., 250ml,DURAN®, Centre neck NS 14/23
What is this article?
Two-necked pear shaped fl., 250ml,DURAN®, Centre neck NS 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.