Description
N 18 magnetic screw cap, silver and closed, with butyl red/PTFE grey septum is a laboratory closure for chromatography vials and related sample vessels. The closed silver cap carries a red butyl / grey PTFE septum specified at 50° Shore A hardness and 1,5 mm septum thickness, giving a defined sealing layer for N 18 neck finishes. Magnetic construction supports handling on compatible autosampler and rack systems, while the screw design provides a secure mechanical fit for routine analytical work. The butyl face contributes elastomeric reseal behaviour; the PTFE contact side offers an inert barrier toward many common solvents and analytes. Packaged as 100 pieces, this closure from manufacturer Macherey-Nagel suits high-throughput sample prep, storage, and injection sequences where consistent septum geometry matters. It fits workflows that specify N 18 magnetic screw caps with a closed top and a dual-layer butyl/PTFE liner. Hardness and thickness values help match method requirements for needle penetration and seal integrity across repeated use in GC and LC environments.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Neck finish: N 18
- Cap type: Magnetic screw cap, closed, silver
- Septum material: Butyl red/PTFE grey
- Hardness: 50° Shore A
- EAN: 4046681138522
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Questions about Mg SC N18-nH,si, Bu r/PTFE gr, 50°, 1.5
What is this article?
Mg SC N18-nH,si, Bu r/PTFE gr, 50°, 1.5 is the article on this page. Luminix Health distributes Macherey-Nagel for laboratory use. It sits in Screw caps & closures, inside Stoppers, caps & closures, in Labware.
A screw cap has a thread and a liner. The thread has to match the bottle. The liner has to survive the liquid: a pulp liner fails in a solvent that a PTFE-faced liner ignores. The colour of the cap is not the specification.
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 Screw caps & closures. The catalogue is Labware.
Shelves beside this one are Rubber & silicone stoppers, 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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.