Description
NBR stopper, black, featuring lower diameter 31 mm, upper diameter 38 mm and height 35 mm is a precision-moulded tapered stopper made from nitrile butadiene rubber for laboratory sealing applications. Its conical geometry ensures a tight fit in standard flask and bottle necks used throughout chemical and biological workflows. Two bores of 7 mm diameter accommodate glass or plastic tubing for gas supply, liquid transfer or probe insertion. Each unit weighs 0,04186 kg net and the stoppers are packed in quantities of 50 pieces. Produced by manufacturer Deutsch & Neumann, the black NBR material offers good mechanical strength together with resistance to oils, greases and a range of solvents. Controlled dimensions guarantee interchangeability with matching glassware. Ideal for distillation apparatus, reaction vessels, filtration systems and general storage bottles, this stopper provides dependable sealing and convenient handling in daily laboratory practice.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 50 pc(s)
- Material: NBR rubber
- Colour: Black
- Lower diameter: 31 mm
- Upper diameter: 38 mm
- Height: 35 mm
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Questions about stopper NBR, black, bottom diameter: 31 mm top diameter: 38 mm height: 35 mm
What is this article?
stopper NBR, black, 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. 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.