Description
Rubber stopper with top diameter 21 mm, bottom diameter 15 mm and height 22 mm is a solid tapered laboratory stopper intended for closing flasks, bottles and other vessels in everyday laboratory practice. Produced from red natural rubber, it combines elasticity with a firm grip so that the cone seats reliably in standard neck openings and helps limit evaporation or contamination during storage. The classic red gum material is widely used for general chemistry, teaching laboratories and routine sample handling where a dependable mechanical seal is required. Packaged as 20 pieces, the set from manufacturer Labbox is practical for equipping multiple workstations or replenishing shared consumable stocks. Net pack weight is 0,175 kg. The tapered geometry—wider at the top and narrower at the bottom—facilitates insertion and removal while still providing sufficient contact surface for a stable fit. These stoppers form part of the standard rubber-stopper range chosen when natural rubber is preferred over cork, silicone or cellulose alternatives. Clear dimensions support accurate matching to existing glassware inventories in research, quality-control and educational environments.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 20 pc(s)
- Material: red natural rubber
- Top diameter: 21 mm
- Bottom diameter: 15 mm
- Height: 22 mm
- EAN: 8434868106840
- GTIN: 08434868106840
- Technical Information Sheet:
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Questions about Rubber stopper, solid, Øtop. 21 mm, Øbottom 15 mm, h 22 mm, 20 pcs
What is this article?
Rubber stopper, solid, Øtop. 21 mm, Øbottom 15 mm, h 22 mm, 20 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.