Description
Round-bottom flask, narrow neck, 250 ml, DURAN® is a classic laboratory vessel for heating, distillation, reflux and general preparative work. Made from borosilicate glass 3.3 under the DURAN® trademark, it combines high thermal shock resistance with excellent chemical durability. The flask has a single narrow neck finished with a beaded rim; neck outer diameter is 34 mm, body outer diameter 85 mm and overall height 144 mm, giving a nominal volume of 250 ml (0,25 l). The spherical bottom promotes uniform heat transfer when used with heating mantles, oil baths or sand baths. Pack size is 10 pieces, each weighing approximately 0,112 kg. These flasks from manufacturer Witeg are well suited to organic synthesis, solvent recovery, concentration steps and as receiving vessels in distillation trains. The Enghals (narrow-neck) design reduces evaporative losses while remaining compatible with common stoppers and adapters. Ideal for routine chemistry, teaching laboratories and pilot-scale preparative work where reliable DURAN® glassware is required.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 10 pc(s)
- Material: Borosilicate glass 3.3
- Neck type: Narrow neck (Enghals)
- Neck outer diameter: 34 mm
- Body outer diameter: 85 mm
- Height: 144 mm
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Flasks, round bottom, narrow neck, 250 m
What is this article?
Flasks, round bottom, narrow neck, 250 m 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.