Description
ST30K behrotest® stopper NS19 is a transparent laboratory stopper made from PPC and intended for Karlsruhe bottles. Measuring 69 mm in length, it is sized for standardised NS19 joints so that sample bottles used in water analysis and environmental testing can be closed securely during storage, transport, or preparation steps. The transparent PPC body allows visual checks at the bottle neck while offering the chemical resistance expected in routine wet-chemistry work. Designed specifically for Karlsruhe-type vessels, the stopper supports consistent sealing geometry across series of samples and helps maintain reliable closures in daily laboratory practice. This single-piece accessory from manufacturer Behr fits into behrotest® bottle setups commonly found in environmental and water-testing laboratories. It is suitable wherever NS19 stoppers are required for Karlsruhe bottles and where a defined length and transparent polymer construction simplify handling and inspection. The ST30K stopper is a practical consumable for analytical workflows that depend on standardised joint sizes and dependable bottle closures.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Product code: ST30K
- Joint size: NS19
- Material: PPC
- Colour: Transparent
- Length: 69 mm
- Technical Information Sheet:
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Questions about ST30K
What is this article?
ST30K is the article on this page. Luminix Health distributes Behr 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?
We deliver across the EU, usually within 2 to 5 working days. More is on Delivery across the EU. 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.
