Description
NBR stopper, black, lower diameter 23 mm, upper diameter 29 mm and height 30 mm is a conical rubber laboratory stopper for closing flasks, bottles and similar vessels. Fabricated from black NBR rubber, it tapers from 29 mm at the top to 23 mm at the bottom and stands 30 mm high, giving a reliable fit in matching glassware necks. Two bores of 5 mm diameter pass through the stopper, permitting the insertion of tubing, thermometers or other laboratory fittings without removing the seal. Packaged in units of 100 pieces, each stopper has a net weight of 0,02106 kg. The dual-bore design supports experimental arrangements that need concurrent access ports while the vessel remains closed. This stopper is supplied by manufacturer Deutsch & Neumann as part of its rubber stopper programme for general laboratory use. NBR provides the flexibility required for a snug, reusable seal, and the black finish allows quick visual distinction among different stopper types. With a 30 mm height the stopper offers sufficient engagement depth for stable seating during routine chemical and biological work on the bench.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Material: NBR rubber
- Colour: Black
- Lower diameter: 23 mm
- Upper diameter: 29 mm
- Height: 30 mm
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about stopper NBR, black, bottom diameter: 23 mm top diameter: 29 mm height: 30 mm
What is this article?
stopper NBR, black, 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. 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.
