Description
Two-neck round-bottom flask with standard ground joints, LBG 3.3, central NS 29/32 and lateral NS 19/26, 1000 ml is a laboratory vessel made from borosilicate glass 3.3 for distillation, reaction and collection work. The round-bottom body and dual necks support simultaneous connection of condensers, dropping funnels or thermometers while maintaining a sealed ground-joint assembly. Nominal volume is 1 l, with two necks configured as a central NS 29/32 joint and a lateral NS 19/26 joint for flexible apparatus setups. Manufactured from borosilicate glass LBG 3.3 (Labbox), the flask offers the thermal and chemical resistance expected of this glass type in routine organic and analytical procedures. Net weight is 0,288 kg. Supplied as a single piece, it fits standard laboratory clamps and heating baths used with round-bottom flasks. Suitable for use as a distillation flask, receiver or multi-neck reaction vessel wherever NS ground joints of these sizes are required.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
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Questions about Flask, round bottom with two necks, LBG 3.3, cent. 29/32, side 19/26, 1000 ml
What is this article?
Flask, round bottom with two necks, LBG 3.3, cent. 29/32, side 19/26, 1000 ml is the article on this page. Luminix Health distributes Labbox 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.

