Description
Round-bottom flask in borosilicate glass 3.3 with medium neck and standard ground joint NS 29/32 is a versatile laboratory vessel for heating, distillation, reaction and collection work. The spherical body promotes uniform heat distribution and efficient mixing under reflux or reduced pressure, while the 100 ml nominal capacity suits small- to medium-scale preparations. Manufactured from borosilicate glass 3.3, the flask offers high chemical resistance and thermal shock tolerance typical of this material class. The medium neck carries a precision-ground NS 29/32 joint that mates reliably with condensers, adapters and other ground-joint glassware; no stopper is supplied. This configuration from manufacturer Hecht is well suited to organic synthesis, solvent recovery, sample concentration and general preparative chemistry where a stable, leak-tight connection is required. The single-piece construction without side arms keeps the apparatus simple and easy to clean. Supplied as one piece, the flask integrates directly into standard laboratory setups using common NS 29/32 accessories.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc
- Product type: Round-bottom flask
- Material: Borosilicate glass 3.3
- Capacity: 100 ml
- Neck type: Medium neck with standard ground joint
- Joint size: NS 29/32
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Questions about Round bottom flasks, borosilicate glass 3.3, with standard ground joint, without
What is this article?
Round bottom flasks, borosilicate glass 3.3, with standard ground joint, without is the article on this page. Luminix Health distributes Hecht for laboratory use. It sits in Round-bottom flasks, inside Beakers & flasks, in Matériel de laboratoire.
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 Matériel de laboratoire.
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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.

