Description
DURAN® flat-bottom flask with narrow neck and beaded rim is a 3 l laboratory vessel produced from borosilicate glass 3.3. Flasks are bulbous containers that, alongside beakers, serve as universally applicable laboratory glassware for distillations and for heating liquids. They are manufactured in many variants—narrow or wide neck, with or without ground joint, and as round- or flat-bottom forms—so the vessel can be selected to suit the application and its fittings. The flat base enables free standing without a support ring. White printed markings are fired into the glass and remain permanently durable. This Enghals model with beaded rim from manufacturer Duran/DWK Life Sciences is supplied as a single piece and is intended for heating. Note that the 3000 ml size is not according to DIN ISO. With a net weight of 0,48 kg and robust borosilicate construction, the flask provides reliable standing stability and long service life for larger-volume thermal work in the laboratory.
This article is part of Flat-bottom flasks, in Beakers & flasks.
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Questions about DURAN® Flat Bottom Flask, narrow neck, with beaded rim
What is this article?
DURAN® Flat Bottom Flask, narrow neck, with beaded rim is the article on this page. Luminix Health distributes DWK Life Sciences 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.
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.

