Description
NR red rubber stopper with lower diameter 21 mm, upper diameter 27 mm and height 30 mm is a tapered laboratory stopper for sealing glassware and apparatus. Made from natural rubber in a clear red colour, it provides a reliable closure for flasks, bottles and reaction vessels used in chemical and biological work. A single central bore of 5 mm diameter permits insertion of tubing, thermometers or probes while preserving seal integrity. The taper from 27 mm at the top to 21 mm at the bottom over 30 mm height ensures a secure fit in a range of neck sizes. Net weight is 0,0129 kg, keeping the stopper light yet durable for repeated handling. This stopper from manufacturer Deutsch & Neumann suits routine laboratory tasks such as distillation set-ups, gas lines and sample containment. The elastic red rubber offers resilience for everyday experimental conditions. It is a practical choice for teaching laboratories, research facilities and quality-control environments that require dependable standard 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: 21 mm
- Upper diameter: 27 mm
- Height: 30 mm
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Questions about stopper NR, red, bottom diameter: 21 mm top diameter: 27 mm height: 30 mm
What is this article?
stopper NR, red, bottom diameter: 21 mm top diameter: 27 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.