Description
N 20 aluminium centre tear-off cap with gold finish is a chromatography closure for secure sealing of compatible N 20 vials in analytical laboratories. The septum combines dark grey butyl rubber with a centric grey PTFE lamination, offering a hardness of 50° Shore A and a septum thickness of 3 mm for consistent mechanical performance. This build supports sample integrity during storage, handling and instrumental analysis in routine chromatographic workflows. Available in a pack of 100 pieces from manufacturer Macherey-Nagel, the cap suits autosampler and manual sampling setups where defined septum properties matter. The aluminium shell with centre tear-off design enables controlled opening, while the PTFE-faced contact surface helps limit unwanted interactions between the septum and the sample matrix. Laboratories running liquid or gas chromatography can use these caps as standard sealing accessories for N 20 vial systems, benefiting from clear hardness and thickness specifications plus a practical pack size for high-throughput environments.
This article is part of Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 100 pc(s)
- Cap type: N 20 aluminium centre tear-off, gold
- Septum: Dark grey butyl / centric grey PTFE lamination
- Hardness: 50° Shore A
- Septum thickness: 3 mm
- EAN: 4046681087547
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Questions about CNTO N20, go, But dgr/ct. PTFEgr, 50°, 3
What is this article?
CNTO N20, go, But dgr/ct. PTFEgr, 50°, 3 is the article on this page. Luminix Health distributes Macherey-Nagel for laboratory use. It sits in Vial caps & septa, inside Vials, caps & septa, in Chromatography equipment.
A vial cap and a septum have to match the vial neck: crimp, screw or snap, and the diameter. The septum material, PTFE/silicone or rubber, decides chemical resistance and how many times a needle can pierce it. A septum that sheds into the solvent becomes ghost peaks.
An autosampler vial is the small closed bottle a chromatograph picks up. The neck is crimp, screw or snap, and the cap and the septum have to be that neck. The septum is the part the needle pierces. A soft septum reseals. A septum that is wrong for the solvent swells or sheds particles into the sample. Inserts reduce the volume when the sample is scarce. The separation they feed is described with IUPAC names and PubChem data.
Which category should I open next?
The category is Vials, caps & septa. The sub-category is Vial caps & septa. The catalogue is Chromatography equipment.
Shelves beside this one are Chromatography accessories, Autosampler vials, Crimpers & decappers and Vial inserts.
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.
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Luminix Health distributes this article from the heart of Europe. Delivery across Europe, two to five days when in stock. 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.
