Description
N 8 PP screw cap, black, closed, with silicone white/PTFE red septum is a precision closure for laboratory vials and sample containers requiring a reliable, chemically resistant seal. The polypropylene cap is designed as a closed version without a centre hole and is fitted with a dual-layer septum of white silicone bonded to red PTFE. Septum hardness is specified at 45° Shore A with a thickness of 1,3 mm, supporting consistent resealing performance and low extractables in analytical workflows. Supplied in packs of 100 pieces, these N 8 screw caps suit chromatography, sample storage and routine laboratory handling where solvent resistance and tight closure matter. The combination of a rigid PP shell and a PTFE-faced silicone liner helps protect samples from contamination while remaining easy to open and reseal. This configuration from manufacturer Macherey-Nagel is widely used with matching N 8 vials in quality control, research and preparative settings that demand reproducible sealing behaviour and clear visual identification of the black closed cap.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Cap type: N 8 PP screw cap, closed
- Colour: Black
- Septum: Silicone white/PTFE red
- Hardness: 45° Shore A
- EAN: 4046681089121
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Questions about SC N8-nH, blk, Sil w/PTFE r, 45°, 1.3
What is this article?
SC N8-nH, blk, Sil w/PTFE r, 45°, 1.3 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.
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.