Description
Hollow NS stopper, DURAN® NS 19/26 is a precision hollow glass stopper engineered for standard taper ground joints in laboratory glassware assemblies. Fabricated from borosilicate glass 3.3, it delivers excellent chemical resistance together with high thermal shock tolerance, supporting reliable sealing of flasks, reactors and other vessels during synthesis, distillation or sample preparation work. The hollow construction lowers overall mass while preserving mechanical strength and ease of insertion or removal, helping to minimise strain on delicate joint surfaces. Its NS 19/26 geometry guarantees a consistent, leak-resistant fit with matching DURAN® components and other standard laboratory apparatus. This stopper from manufacturer Hecht is well suited to routine organic and inorganic chemistry workflows, quality-control laboratories and teaching environments where inert, reusable glass closures are required. Supplied as a single piece, it integrates directly into existing glassware sets and contributes to clean, reproducible experimental setups without introducing metallic or polymeric contaminants.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Type: Hollow NS stopper
- Joint size: NS 19/26
- Material: Borosilicate glass 3.3
- Brand: DURAN®
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Questions about Stoppers hollow, DURAN®, interchangeable NS 19/26
What is this article?
Stoppers hollow, DURAN®, interchangeable NS 19/26 is the article on this page. Luminix Health distributes Hecht 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.