Description
Polyethylene stopper NS 7/16 is an octagonal ground-joint stopper made from high-density polyethylene (PE-HD) for sealing standard laboratory glassware with NS 7/16 joints. Conforming to DIN 12254, it provides a reliable plastic alternative to glass stoppers where chemical resistance, light weight and reduced breakage risk are preferred. The octagonal head allows a firm grip for insertion and removal, supporting secure closure of flasks, adapters and other jointed apparatus in everyday laboratory workflows. This stopper from manufacturer Witeg is supplied as a single piece and is intended for routine use in chemistry, analytical and teaching laboratories that standardise on NS joint systems. PE-HD construction offers good mechanical stability for repeated opening and closing cycles under typical ambient laboratory conditions. As a compact consumable fitting the smallest common NS size, it is a practical spare or replacement part for maintaining tight seals on small-volume glassware without introducing glass-on-glass wear at the joint.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Product type: Ground joint stopper
- Material: High-density polyethylene (PE-HD)
- Joint size: NS 7/16
- Shape: Octagonal head
- Standard: DIN 12254
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Questions about Polyethylene-stopper NS 7/16
What is this article?
Polyethylene-stopper NS 7/16 is the article on this page. Luminix Health distributes Witeg 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.