Description
Rotilabo®-standard ground glass joint stoppers in green polyethylene (PE) are conical joint closures sized 12/21 for laboratory glassware. These PE plugs belong to the stoppers and clamps category and serve as practical seals for matching standard ground joints on flasks, adapters and related apparatus. Each pack contains 10 pc(s) and is finished in green for straightforward visual sorting of the 12/21 size among mixed joint inventories. The set has a stated weight of 0,031 kg, supporting simple bench organisation and stock control. Manufactured in the Rotilabo® line from ROTH SELECTION, the stoppers are intended for routine laboratory sealing tasks where a lightweight PE alternative to glass is preferred. Colour-coded PE construction aligns with common labware workflows for vessels and consumables, helping keep conical-joint assemblies clearly identified during setup, use and storage. The product is supplied as a ready pack of green 12/21 stoppers for general laboratory plug applications.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 10 pc(s)
- Product type: Ground glass joint stopper
- Brand: Rotilabo®
- Material: PE
- Colour: green
- Conical joint: 12/21
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Questions about Rotilabo®-standard ground glass joint, stoppers, PE, green, conical joint 12/21
What is this article?
Rotilabo®-standard ground glass joint, stoppers, PE, green, conical joint 12/21 is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
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 Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone 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.