Description
The 3-neck flask 250 ml with centre neck NS 29/32 and two straight side necks NS 29/32 is a multi-neck round-bottom laboratory vessel for synthesis, distillation and controlled reaction work. Fabricated from borosilicate glass 3.3, it combines high chemical resistance with reliable thermal stability for routine heating and cooling cycles. Three standardised ground-glass joints of size NS 29/32 permit simultaneous connection of condensers, dropping funnels, thermometers or inert-gas lines while maintaining a closed system. The nominal volume of 250 ml and net weight of 0,162 kg make this compact flask well suited to small- and medium-scale preparative chemistry. Straight side-neck geometry simplifies apparatus assembly for reflux, fractional distillation or multi-component reactions. Available as a single piece from manufacturer Rettberg, the flask belongs to the established range of ground-joint round-bottom vessels used as reaction, distillation or receiving flasks. Its robust construction supports repeated laboratory workflows in research, teaching and quality-control environments that require dependable multi-neck glassware with NS 29/32 joints.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Material: Borosilicate glass 3.3
- Nominal volume: 250 ml
- Number of necks: 3
- Joint size: NS 29/32
- Neck configuration: Centre neck NS 29/32, 2× side necks NS 29/32 (straight)
- Technical Information Sheet:
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Questions about 3-neck bottom flask, 250 ml, mn size 29/32, 2x sn size 29/32
What is this article?
3-neck bottom flask, 250 ml, mn size 29/32, 2x sn 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.