Description
Conical ground joint stopper, brown, Boro 3.3, NS 10/19, ground is a precision laboratory closure for standard taper joints. Crafted from borosilicate glass 3.3, the brown-tinted stopper delivers a secure seal on flasks, adapters and reaction vessels fitted with NS 10/19 connections. The finely ground surface ensures reliable contact, reducing vapour loss and contamination risk during heating, reflux or storage of light-sensitive materials. Its compact form and low net weight of 0,0028 kg make it convenient for everyday bench work. Supplied as a single-piece unit from manufacturer Brand, the stopper integrates smoothly into analytical, preparative and teaching laboratories that rely on interchangeable ground-joint glassware. The conical geometry matches common European joint standards, allowing quick insertion and removal while preserving joint integrity under mild vacuum or positive pressure. Chemists value the chemical resistance and thermal stability of Boro 3.3 glass for repeated autoclaving or solvent exposure. Ideal for organic synthesis, sample protection and routine apparatus assembly, this brown ground joint stopper supports clean, reproducible laboratory practice without unnecessary complexity.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: Boro 3.3 borosilicate glass
- Colour: brown
- Joint size: NS 10/19
- Finish: ground
- EAN: 4033378489876
- Technical Information Sheet:
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Questions about Conical joint stopper, amber, Boro 3.3, NS 10/19, honed
What is this article?
Conical joint stopper, amber, Boro 3.3, NS 10/19, honed 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 Matériel de laboratoire.
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 Matériel de laboratoire.
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.