Description
NR red rubber stopper with lower diameter 23 mm, upper diameter 29 mm and height 30 mm is a tapered laboratory stopper intended for sealing glassware and apparatus. Produced from natural rubber in a distinctive red colour, it delivers a dependable closure for flasks, bottles and reaction vessels in chemical and biological laboratories. One central bore of 5 mm diameter allows passage of glass tubing, thermometers or probes without loss of seal performance. The tapered profile, reducing from 29 mm at the top to 23 mm at the bottom across a 30 mm height, guarantees a snug fit in common neck sizes. Net weight is 0,01518 kg, combining lightness with robustness for repeated laboratory use. This stopper from manufacturer Deutsch & Neumann supports everyday workflows including distillation assemblies, gas delivery systems and sample storage. The elastic red rubber material provides the resilience needed under standard experimental conditions. It is well suited to teaching labs, research institutes and industrial quality-control settings requiring reliable rubber stoppers.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: Rubber
- Colour: Red
- Lower diameter: 23 mm
- Upper diameter: 29 mm
- Height: 30 mm
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Questions about stopper NR, red, bottom diameter: 23 mm top diameter: 29 mm height: 30 mm
What is this article?
stopper NR, red, bottom diameter: 23 mm top diameter: 29 mm height: 30 mm is the article on this page. Luminix Health distributes Deutsch & Neumann for laboratory use. It sits in Rubber & silicone stoppers, inside Stoppers, caps & closures, in Labware.
A rubber or silicone stopper is pushed into a mouth. The size number corresponds to a top and bottom diameter. Silicone survives higher temperatures and more autoclave cycles. Natural rubber is attacked by oils and by some solvents.
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 Rubber & silicone stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, 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.