Description
Rubber stopper with top diameter 28 mm, bottom diameter 21,5 mm and height 31 mm is a larger tapered laboratory closure designed for wider flask and bottle necks. Produced from red natural rubber, it delivers the elasticity and sealing contact typical of traditional gum stoppers used in day-to-day laboratory work. The pronounced taper from 28 mm at the top to 21,5 mm at the bottom assists reliable seating, while the 31 mm height offers a substantial body for handling and secure placement. Supplied in a pack of 10 pieces, the format suits laboratories that need fewer units of this larger size for teaching, preparation or general research support. These stoppers from manufacturer Labbox are appropriate for non-critical closure tasks in chemistry, biology and sample workflows where a robust natural-rubber plug is preferred. Net pack weight is 0,210 kg. Select this dimension when a wider tapered rubber stopper is required for temporary or repeated sealing of standard laboratory glassware without additional hardware.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Material: Red natural rubber
- Top diameter: 28 mm
- Bottom diameter: 21,5 mm
- Height: 31 mm
- EAN: 8434868045422
- GTIN: 08434868045422
- Technical Information Sheet:
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Questions about Rubber stopper, solid, Øtop. 28 mm, Øbottom 21,5 mm, h 31 mm, 10 pcs
What is this article?
Rubber stopper, solid, Øtop. 28 mm, Øbottom 21,5 mm, h 31 mm, 10 pcs is the article on this page. Luminix Health distributes Labbox 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.