Description
Aluminium overpressure safety cap N 20-L is a silver open-top closure for chromatography vials, fitted with a light grey butyl and dark grey PTFE septum. Hardness is 50° Shore A and septum thickness is 3,0 mm, giving a robust sealing layer for applications that benefit from thicker septa and defined compressibility. Packaged as 100 pieces, this N 20 aluminium safety-style cap from manufacturer Macherey-Nagel is intended for laboratories handling headspace or pressure-sensitive sample workflows where reliable crimp or seal integrity matters. The butyl layer contributes elasticity and barrier properties, while the dark grey PTFE face provides a chemically resistant contact surface toward many solvents used in GC sample introduction. Open-hole (L) design keeps the septum accessible for needle penetration, and the silver aluminium shell supports clear visual sorting on the bench. Use this chromatography accessory with matching N 20 vials when a thicker PTFE-faced butyl septum and overpressure-oriented aluminium construction are specified for routine analytical sealing tasks.
This article is part of Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 100 pc(s)
- Type: Aluminium overpressure safety cap N 20-L
- Colour: Silver
- Septum: Butyl light grey/PTFE dark grey
- Hardness: 50° Shore A
- EAN: 4046681086274
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Questions about PR N20-H, si, But lgr/PTFE dgr, 50°, 3.0
What is this article?
PR N20-H, si, But lgr/PTFE dgr, 50°, 3.0 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.
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.