Description
PTFE ground joint stopper NS 19/26 is a robust laboratory sealing component for standard conical ground-glass joints in preparative chemistry, distillation and sample containment. Formed entirely from polytetrafluoroethylene, it establishes a hermetic closure that limits evaporation and shields contents from airborne contamination. The inert PTFE surface offers excellent resistance to aggressive organic solvents, strong acids and bases, reducing the risk of stopper attack or sample cross-contamination. Rated for use at temperatures up to 270 °C, the stopper retains shape and sealing integrity under thermal stress typical of heated reaction setups and warm storage. The NS 19/26 joint size matches widely used flasks, condensers and intermediate vessels, supporting grease-free assembly where a dry PTFE interface is advantageous. Supplied as a single unit with a net weight of 0,024 kg from manufacturer Labbox, this plastic stopper provides a practical, chemically durable alternative to glass stoppers for research, process development and quality-control laboratories requiring reliable hermetic performance.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: PTFE
- Joint size: NS 19/26
- Seal type: Hermetic
- Max. temperature: 270 °C
- EAN: 8434868056275
- GTIN: 08434868056275
- Technical Information Sheet:
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Questions about Flat head stopper, PTFE, 19/26
What is this article?
Flat head stopper, PTFE, 19/26 is the article on this page. Luminix Health distributes Labbox 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.