Description
BOLA sealing stopper NS 19/26 PTFE with knurled handle is a laboratory closure made from polytetrafluoroethylene (PTFE) for standard ground-glass joints. It combines a Normschliff taper with external sealing rings to achieve a secure fit without greasing. Compared with conventional glass stoppers, the PTFE construction is easier to dismantle after use, reducing the likelihood of seized joints during everyday laboratory procedures. The knurled handle offers a firm grip for controlled insertion and removal. Supplied as a pack of 3 pieces from manufacturer Bohlender, each stopper has a net weight of 0,025 kg and is sized for NS 19/26 joints on flasks, adapters and reaction vessels. The solid PTFE body supports clean, grease-free sealing in chemical and analytical workflows. Should the stopper expand through heating, breakage of the glass joint can occur in rare cases; temperature management is therefore advisable. These BOLA stoppers give laboratories a practical PTFE alternative for NS 19/26 closures where easy removal and grease-free operation matter.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 3 pc(s)
- Material: Polytetrafluoroethylene (PTFE)
- Joint size: NS 19/26
- Handle type: Knurled
- Country of origin: Germany
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Questions about BOLA Stoppers, NS 19/26 PTFE, knurled grip
What is this article?
BOLA Stoppers, NS 19/26 PTFE, knurled grip is the article on this page. Luminix Health distributes Bohlender 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.