Description
Flat-bottom flask 250 ml NS 19/26 is a clear borosilicate glass 3.3 laboratory vessel with a nominal volume of 0,25 l. Designed as a medium-neck standing flask, it features a standard ground joint NS 19/26 for secure connection to complementary glassware. External diameter measures 85 mm and overall height 135 mm, giving a stable footprint on the bench while remaining compact enough for routine heating and reaction work.
This article is part of Flat-bottom flasks, in Beakers & flasks.
Manufactured from chemically resistant borosilicate glass 3.3, the flask withstands typical thermal and chemical stresses encountered in analytical and preparative laboratories. The flat base allows direct placement on hotplates or heating mantles without additional support rings. This 250 ml model from manufacturer Witeg is supplied in packs of 10 pieces and is well suited for distillation set-ups, reflux reactions, sample preparation and general laboratory use where a reliable medium-neck flat-bottom flask is required.
Key features
- Pack size: 10 pc(s)
- Material: borosilicate glass 3.3
- Nominal volume: 0,25 l
- Joint size: NS 19/26
- Neck type: medium neck
- Outer diameter: 85 mm
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Questions about Flat bottom flask 250 ml ST 19/26
What is this article?
Flat bottom flask 250 ml ST 19/26 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Flat-bottom flasks, inside Beakers & flasks, in Labware.
A flat-bottom flask stands on the bench without a cork ring, which a round-bottom flask will not do. It is for heating on a plate and for simple setups. It is a poorer shape than a round bottom for even boiling under vacuum.
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 Flat-bottom flasks. The catalogue is Labware.
Shelves beside this one are Round-bottom flasks, Beakers, Erlenmeyer flasks, Reaction vessels & jacketed vessels, 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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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.