Description
Silicone stopper with upper diameter 6,5 mm, lower diameter 3,5 mm and length 15 mm is a transparent, flexible laboratory closure for small openings, tubes and apparatus. Manufactured from silicone, it offers elastic sealing behaviour that supports repeated insertion and removal without cracking under normal laboratory handling. The tapered profile from 6,5 mm at the top to 3,5 mm at the bottom helps seat the stopper securely in matching bores while the 15 mm length provides a practical grip and insertion depth for compact setups. Typical uses include temporary sealing of glassware necks, tubing ends and small vessels in analytical, teaching and general laboratory work where a soft, chemically familiar elastomer is preferred. Supplied in packs of 10 pieces from manufacturer Witeg, these stoppers suit routine sample handling and apparatus assembly. Dimensions follow the stated upper and lower diameters and length so that users can match the stopper to the required opening size with confidence in everyday lab practice.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Material: silicone
- Colour: transparent
- Upper diameter: 6,5 mm
- Lower diameter: 3,5 mm
- Length: 15 mm
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Questions about Silicone stopper O-Ø 6.5mm U-Ø 3.5mm length 15mm
What is this article?
Silicone stopper O-Ø 6.5mm U-Ø 3.5mm length 15mm 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.