Description
Octagonal cap stopper NS 34/35 is a half-hollow ground-joint stopper produced from SBW glass to DIN 12252 for sealing larger laboratory glassware with NS 34/35 standard taper joints. The octagonal head offers a positive grip for safe insertion and extraction, while the half-hollow construction balances weight and sealing performance on flasks, reactors and wide-neck adapters. Supplied as a single unit with a net weight of 0,095 kg, this stopper from manufacturer Witeg is intended for routine closure tasks in preparative chemistry, process development and general laboratory work. The uncoated glass surface remains compatible with typical laboratory solvents and reagents. Accurate NS 34/35 geometry guarantees interchangeability within DIN-compliant ground-joint systems, supporting modular setups for distillation, reflux and bulk storage. The distinctive octagonal shape limits rolling on the bench and aids rapid identification among other joint sizes. Well suited to teaching, research and industrial laboratories that rely on classic glassware, the stopper delivers a straightforward mechanical seal that can be used dry or with joint grease according to local protocol.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Joint size: NS 34/35
- Material: SBW glass
- Design: Half-hollow
- Standard: DIN 12252
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Questions about ST-stopper, octagonal plate,ST34/35
What is this article?
ST-stopper, octagonal plate,ST34/35 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Screw caps & closures, inside Stoppers, caps & closures, in Labware.
A screw cap has a thread and a liner. The thread has to match the bottle. The liner has to survive the liquid: a pulp liner fails in a solvent that a PTFE-faced liner ignores. The colour of the cap is not the specification.
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 Screw caps & closures. The catalogue is Labware.
Shelves beside this one are Rubber & silicone stoppers, Ground-joint glass 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.