Description
Silicone stopper with upper diameter 12,0 mm, lower diameter 8,0 mm and length 20 mm is a transparent, flexible laboratory stopper intended for sealing flasks, tubes and other glassware. Its conical shape narrows from 12,0 mm at the top to 8,0 mm at the base across a 20 mm length, providing a tapered fit for corresponding openings. Fabricated from silicone, the stopper offers elasticity and a clear finish that supports visual monitoring of contents in transparent vessels. These defined dimensions suit routine laboratory work where a soft silicone closure is required. Available as a pack of 10 pieces from manufacturer Witeg, each stopper has a net weight of 0,002 kg and is designed for straightforward insertion and removal during daily handling. The flexible silicone material helps achieve a reliable seal while remaining practical for repeated use in research, teaching and analytical settings. This intermediate size complements other silicone, rubber, cork and cellulose stoppers used for general vessel closure and laboratory organisation.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Material: Silicone
- Upper diameter: 12,0 mm
- Lower diameter: 8,0 mm
- Length: 20 mm
- Appearance: Transparent
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Questions about Silicone stopper O-Ø 12.0mm U-Ø 8.0mm length 20mm
What is this article?
Silicone stopper O-Ø 12.0mm U-Ø 8.0mm length 20mm is the article on this page. Luminix Health distributes Witeg 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.