Description
Rubber stopper, solid, with a top diameter of 8 mm, a bottom diameter of 4 mm and a length of 20 mm is a compact laboratory closure for sealing narrow openings in glassware and small apparatus. The tapered solid rubber body provides a firm mechanical fit that helps retain liquids, powders or vapours during routine handling, storage and simple experimental setups. Its modest dimensions suit micro and small-scale vessels where a short, reliable plug is preferred over larger standard stoppers. Manufactured from rubber and supplied as a single piece from manufacturer Witeg, the stopper is intended for general laboratory use in chemistry, biology and teaching environments. The solid construction avoids hollow cavities, supporting straightforward cleaning and reuse where appropriate. With a net weight of only 0,001 kg, it adds negligible mass to delicate assemblies. Typical applications include temporary sealing of tubes, flasks and sample containers during preparation, transport between benches, or short-term holding of reagents under ambient laboratory conditions.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: Rubber
- Design: Solid
- Top diameter: 8 mm
- Bottom diameter: 4 mm
- Length: 20 mm
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Questions about Plug Ø top 8mm, Ø bottom 4mm, length 20mm
What is this article?
Plug Ø top 8mm, Ø bottom 4mm, 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.