Description
Stoppers made of silicone rubber featuring a 3 mm diameter hole are laboratory plugs with outer dimensions of 12,5 x 16,5 x 20 mm, intended for sealing vessel necks while permitting a central feed-through. The bore accommodates tubing, small probes or simple venting in setups where a solid stopper would be unsuitable. Silicone rubber delivers an elastic, conforming seal suited to repeated placement and removal on glassware and comparable laboratory vessels. Packaged as 25 pc(s) from manufacturer ROTH SELECTION, the product supports efficient restocking of shared benches, teaching laboratories and routine analytical stations. The combination of the stated size and 3 mm hole helps match common neck geometries when a soft plug with an open centre is required. At a pack weight of 0,090 kg, the unit is compact for storage among other stoppers and clamps. These silicone rubber stoppers sit within the laboratory glass, vessels and consumables category and are used for everyday sealing, temporary closures and tubing passage during sample handling, preparation steps and general vessel protection. They offer a practical, non-rigid option for research, quality-control and educational workflows that rely on flexible plugs of defined dimensions.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 25 pc(s)
- Product type: Stoppers with hole
- Material: Silicone rubber
- Hole diameter: 3 mm
- Dimensions: 12,5 x 16,5 x 20 mm
- Weight: 0,090 kg
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Questions about Stoppers made of silicone rubber, Ø Hole 3 mm, 12.5 x 16.5 x 20 mm, 25 unit(s)
What is this article?
Stoppers made of silicone rubber, Ø Hole 3 mm, 12.5 x 16.5 x 20 mm, 25 unit(s) is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Rubber & silicone stoppers, inside Stoppers, caps & closures, in Matériel de laboratoire.
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 Matériel de laboratoire.
Shelves beside this one are Screw caps & closures, Ground-joint glass stoppers, Lids & seals and Closures (other).
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
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.