Description
Standard septa N 12 ST are precision sealing discs for chromatography vial closures and related analytical sample handling. Each septum has an outer diameter of 12 mm and a thickness of 4 mm, giving a defined geometry for secure seating in matching N 12 caps. The pack contains 50 pieces, supporting routine GC and HPLC workflows where consistent resealing after needle penetration is required. These standard septa are intended for everyday laboratory use in sample preparation, injection and short-term storage of analytical solutions. Dimensional control of the 12 mm diameter and 4 mm thickness helps maintain a reliable barrier against evaporation and contamination while remaining compatible with manual and automated injectors. Offered by manufacturer Macherey-Nagel within its chromatography accessories range, the N 12 ST format suits quality-control, method-development and high-throughput sequences that do not demand specialised high-temperature materials. Laboratories select this pack size when they need ready-to-use septa with clear dimensional specifications for screw or crimp closures in analytical chemistry environments.
This article belongs on Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 50 pc(s)
- Product type: Standard septa N 12 ST
- Outer diameter: 12 mm
- Thickness: 4 mm
- EAN: 4046681087080
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Questions about Standard septa, N 12 ST
What is this article?
Standard septa, N 12 ST 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. 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.