Description
Round-bottom flask 250 ml KS 35/20 coated is a single-neck laboratory vessel with spherical ground joint KS 35/20, designed for distillation, reaction and collection work. Made from clear borosilicate glass 3.3, it combines high chemical resistance with good thermal stability for everyday laboratory use. The flask has a nominal volume of 0,25 l, an outer diameter of 81 mm and a height of 140 mm. A robust plastic coating adds mechanical protection and helps retain contents should the glass break under stress. The spherical joint supports reliable connections in vacuum or distillation assemblies while the clear glass body permits straightforward visual observation of the process. Packs of 10 pieces are available from manufacturer Witeg, making the coated flask practical for routine bench work, teaching laboratories and preparative setups that require both durability and optical clarity. Its single-neck configuration keeps the design simple and versatile for standard ground-joint glassware systems.
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: 0,25 l
- Joint size: KS 35/20
- Outer diameter: 81 mm
- Height: 140 mm
- Material: Borosilicate glass 3.3
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Questions about Round bottom flask 250 ml S 35/20 plastic coated
What is this article?
Round bottom flask 250 ml S 35/20 plastic coated 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.
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.