Description
DURAN® polyethylene stopper NS 7/16 is an ergonomic laboratory stopper crafted from low-density polyethylene (LDPE) for volumetric flasks, mixing cylinders and standing bottles. Multiple grooves on the cone ensure optimal tightness and minimise solvent evaporation during preparation and storage of standard solutions. Colour-coded inserts allow rapid visual assignment of the NS size and follow the same colour system used by Keck™ clamps for consistent laboratory identification. A batch clock on the product indicates the production period (year and month), while the underside carries the material designation “PE04”. Supplied without bottle in a pack of ten pieces from manufacturer Duran/DWK Life Sciences, these stoppers simplify safe opening and closing and support clear colour-based organisation on the bench. The ergonomic shape improves handling security, making the stoppers suitable for routine analytical work where reliable sealing and quick size recognition are essential. Ideal for preparing and storing normal solutions while reducing the risk of evaporation losses.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Joint size: NS 7/16
- Material: Low-density polyethylene (LDPE)
- Design: Ergonomic with grooved cone
- Colour coding: Matches Keck™ clamp system
- EAN: 4032051308756
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Questions about DURAN® Polyethylen-Stopper
What is this article?
DURAN® Polyethylen-Stopper is the article on this page. Luminix Health distributes DWK Life Sciences 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.