Description
Conical joint stopper NS 45/40 is a hollow laboratory stopper produced from borosilicate glass 3.3 and finished with a hexagonal grip disc for convenient handling. It is designed to close standard ground-glass joints of size NS 45/40 on large flasks, reaction vessels and process glassware. The hollow body keeps overall weight low, while the precision-ground conical surface guarantees a secure, leak-resistant fit. Borosilicate glass 3.3 supplies the chemical resistance and thermal stability essential for demanding laboratory applications such as scale-up synthesis and solvent recovery. Offered as a single unit from manufacturer Brand, the stopper is fully compatible with conventional laboratory glassware systems. The hexagonal grip disc enables firm, controlled insertion and removal, improving safety and speed during apparatus assembly. Suitable for research, pilot-plant and educational settings, it maintains joint performance through repeated thermal cycling and chemical exposure. Its robust yet lightweight construction makes it a practical, reusable closure for routine and specialised glassware work.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Joint size: NS 45/40
- Material: Borosilicate glass 3.3
- Design: Hollow with hexagonal grip disc
- EAN: 4033378280749
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Questions about Conical joint stopper Boro 3.3, NS 45/40, hollow, hexagonal grip
What is this article?
Conical joint stopper Boro 3.3, NS 45/40, hollow, hexagonal grip is the article on this page. Luminix Health distributes BRAND for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone stoppers, Lids & seals and Closures (other).
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.