Description
NR rubber stopper, red, with a lower diameter of 31 mm, an upper diameter of 38 mm and a height of 35 mm is a tapered laboratory stopper designed for sealing larger flasks, bottles and glassware necks. Fabricated from rubber, this red stopper contains a single central bore of 7 mm diameter, allowing insertion of tubing, thermometers or glass rods for transfer of gases and liquids. The conical shape ensures a firm friction fit in standard laboratory openings. Each stopper has a net weight of 0,04059 kg. Supplied by manufacturer Deutsch & Neumann in packs of 50 pieces, the stoppers support general chemistry, biology and analytical workflows requiring secure temporary closure. Rubber elasticity provides consistent sealing performance with aqueous media and many organic solvents encountered in daily laboratory use. Accurate control of the 31 mm to 38 mm taper and 35 mm height guarantees compatibility with typical European glassware sizes. The single 7 mm bore keeps the stopper practical for straightforward apparatus assemblies without additional machining.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 50 pc(s)
- Material: Rubber
- Colour: Red
- Lower diameter: 31 mm
- Upper diameter: 38 mm
- Height: 35 mm
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Questions about stopper NR, red, bottom diameter: 31 mm top diameter: 38 mm height: 35 mm
What is this article?
stopper NR, red, bottom diameter: 31 mm top diameter: 38 mm height: 35 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. Delivery across Europe, two to five days when in stock. 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.
