Description
Screw caps N-8 closed are compact black polypropylene (PP) closures with a butyl-PTFE-laminated seal for small-format laboratory vessels that use the N-8 screw-thread standard. The fully closed top and laminated gasket provide a defined sealing interface suited to sample vials, reagent bottles and related containers common in analytical and preparative work. Black PP delivers a sturdy, chemically familiar shell for routine laboratory handling, while the butyl-PTFE laminate combines elastomeric compliance with a PTFE contact layer often preferred when reduced interaction with the sample path is desired. Supplied from manufacturer Witeg in packs of 100 pieces and a net weight of 0,052 kg, these caps support efficient stocking of high-throughput benches and shared instrument areas. The N-8 geometry aligns with widely used mini-vial and small-bottle neck finishes, helping laboratories maintain consistent closure practice across methods. Clear material specification and pack presentation make the product straightforward to identify, reorder and integrate into existing consumable inventories without changing established N-8 workflows.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Cap size: N-8
- Material: Black polypropylene (PP)
- Seal: Butyl-PTFE laminated
- Design: Closed
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Questions about Screw caps N-8 closed
What is this article?
Screw caps N-8 closed is the article on this page. Luminix Health distributes Witeg 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.