Description
Hollow NS stopper, DURAN® NS 7/16 is a precision ground-joint laboratory stopper designed for reliable sealing of glassware with standard NS 7/16 joints. Manufactured from high-quality borosilicate glass 3.3, this hollow stopper offers excellent chemical resistance and thermal stability for everyday laboratory use. The DURAN® glass construction ensures dimensional accuracy and a tight fit, making it suitable for flasks, adapters and reaction vessels in organic synthesis, analytical chemistry and general wet-chemistry workflows. Supplied as a single piece from manufacturer Hecht, the stopper features a hollow design that reduces weight while maintaining mechanical strength. Its smooth ground surface provides a secure, leak-resistant closure without the need for additional sealing media under normal conditions. Ideal for research, teaching and quality-control laboratories that require interchangeable glassware components conforming to standard joint sizes. The robust borosilicate material withstands typical autoclaving and thermal cycling encountered in routine lab practice, supporting long service life and consistent performance across a wide range of solvents and reagents.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Product type: Hollow NS stopper
- Joint size: NS 7/16
- Material: Borosilicate glass 3.3
- Brand: DURAN®
- Design: Hollow
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Questions about Stoppers hollow, DURAN®, interchangeable NS 7/16
What is this article?
Stoppers hollow, DURAN®, interchangeable NS 7/16 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.