Description
Three-necked round-bottom flask, 250 ml serves multi-port laboratory work where a larger side-joint size is preferred for condensers, addition funnels or gas lines. The centre neck is NS 24/29 and the two side necks are NS 19/26 and angled, offering a balanced layout for simultaneous connection of several ground-glass components. Round-bottom geometry aids uniform heating and stirring in organic reactions, reflux arrangements and multi-step preparations. Made from DURAN® glass by manufacturer Lenz, the flask is supplied as 1 pc and weighs 0,142 kg, compatible with conventional heating mantles, oil baths and laboratory clamps. Angled side necks improve access and reduce clash between adapters, tubing and secondary apparatus during extended runs. The 250 ml working volume suits preparative chemistry, process development and teaching laboratories that require durable NS joints and chemical resistance. This configuration fits naturally within round flasks and flasks with ground glass joints for routine multi-neck synthesis and distillation tasks.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Product type: Three-necked round-bottom flask
- Capacity: 250 ml
- Centre neck: NS 24/29
- Side necks: NS 19/26, angled
- Material: DURAN®
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Questions about Three-necked round-bottom flask, 250 ml, Centre neck 24/29, side neck 19/26
What is this article?
Three-necked round-bottom flask, 250 ml, Centre neck 24/29, side neck 19/26 is the article on this page. Luminix Health distributes Lenz 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?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
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.
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.