Description
Ground joint stopper NS 19/26 is a hollow laboratory stopper made from borosilicate glass 3.3, designed for reliable sealing of standard ground-joint glassware. It features a hexagonal grip for secure handling and a closed tip that supports clean, controlled use in everyday chemical and analytical work. The stopper fits NS 19/26 joints commonly found on flasks, condensers, adapters and reaction vessels, helping maintain a tight connection during mixing, heating or storage of reagents. Supplied as a pack of 10 pieces from manufacturer Marienfeld, the set is practical for equipping multiple setups or keeping spare stoppers on hand. Borosilicate glass 3.3 provides good thermal and chemical resistance for routine laboratory media and moderate temperature changes. The hexagonal grip allows easy insertion and removal without excessive force, while the hollow body keeps weight low. These stoppers suit research, quality-control and teaching laboratories that need consistent, reusable ground-joint seals for standard glassware configurations.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Material: Borosilicate glass 3.3
- Joint size: NS 19/26
- Design: Hollow with hexagonal grip
- Tip: Closed tip
- EAN: 4250317312242
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Questions about Standard ground-joint stoppers NS 19/26, PU=10
What is this article?
Standard ground-joint stoppers NS 19/26, PU=10 is the article on this page. Luminix Health distributes Marienfeld 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.