Description
Round-bottom flask, 250 ml, socket NS 29/32 is a single-neck laboratory vessel made from borosilicate glass 3.3. It features a medium neck with a precision ground joint of NS 29/32, ensuring reliable connections to condensers, adapters and other standard glassware. The spherical body promotes uniform heat distribution during distillation, reflux reactions or solvent recovery and serves equally well as a receiving flask. Nominal volume is 250 ml with a net weight of 0,106 kg, offering a practical balance of capacity and handling ease. Produced by manufacturer Rettberg, the flask delivers the thermal shock resistance and chemical durability expected of borosilicate glass 3.3 in everyday organic synthesis, sample preparation and analytical work. The medium-neck design allows convenient insertion of stirrers, thermometers or dropping funnels while remaining compact enough for rotary evaporators and heating mantles. Supplied as one piece, it integrates directly into existing ground-joint assemblies 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
- Nominal volume: 250 ml
- Joint size: NS 29/32
- Material: Borosilicate glass 3.3
- Neck type: Medium neck
- Number of necks: 1
- Technical Information Sheet:
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Questions about Round bottom flask, 250 ml, socket size 29/32
What is this article?
Round bottom flask, 250 ml, socket size 29/32 is the article on this page. Luminix Health distributes Rettberg 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.
How does ordering and shipping work?
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.