Description
Round-bottom flask 250 ml NS 19/26 is a single-neck laboratory flask made from clear borosilicate glass 3.3 for distillation, reflux, synthesis and collection applications. Nominal volume is 250 ml (0,25 l), with an outer diameter of 85 mm and a height of 140 mm, matching common heating mantles and support setups. The medium neck carries a ground joint NS 19/26 for leak-tight coupling to condensers, adapters, still heads and other jointed apparatus. Clear borosilicate glass 3.3 delivers the chemical resistance and thermal stability required for routine heating and cooling, while the transparent wall allows continuous observation of the contents. From manufacturer Witeg, the flask is packed in units of 10 pieces and serves as a distillation flask, receiver or reaction vessel in teaching, preparative and general laboratory workflows. One central neck simplifies assembly of standard distillation trains and reflux configurations. Net weight is approximately 0,11 kg per flask. Suitable wherever durable ground-joint round-bottom glassware is specified for organic or inorganic bench work.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 250 ml
- Joint size: NS 19/26
- Neck type: Medium neck, 1 neck
- Outer diameter: 85 mm
- Height: 140 mm
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Questions about Round bottom flask 250 ml ST 19/26
What is this article?
Round bottom flask 250 ml ST 19/26 is the article on this page. Luminix Health distributes Witeg 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.
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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.