Description
Polyethylene stopper NS 19/26 is an octagonal laboratory stopper engineered for standard ground joints of size NS 19/26. Made from low-density polyethylene (LDPE), it provides a practical seal for round-bottom flasks, Erlenmeyer flasks and other glassware that uses the conical joint system. The design conforms to DIN 12254, ensuring dimensional interchangeability with common European laboratory apparatus. An octagonal head gives a firm grip for insertion and withdrawal, reducing slippage during routine handling. Net weight is only 0,005 kg, so the stopper remains light enough for frequent use without adding bulk to assemblies. Supplied as a single piece, this component from manufacturer Witeg supports everyday sealing tasks in teaching laboratories, quality-control labs and research settings where polyethylene resistance to many aqueous media is sufficient. The widely used NS 19/26 joint size integrates readily into existing glassware sets. Its polyethylene body suits numerous reagents encountered in routine wet chemistry and offers a practical alternative to glass stoppers for many sealing applications.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Joint size: NS 19/26
- Material: Low-density polyethylene (LDPE)
- Shape: Octagonal
- Standard: DIN 12254
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Questions about Polyethylene-stopper ST 19/26
What is this article?
Polyethylene-stopper ST 19/26 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.