Description
Black screw caps with DIN thread GL 18 are robust laboratory closures manufactured from HDPE and equipped with a double-acting cone seal. The dual-action conical sealing geometry supports a tight fit on matching GL 18 bottle necks, helping to reduce leakage and evaporation during storage and transport of laboratory liquids. The black HDPE construction offers good chemical resistance for many aqueous media and common laboratory solvents used in routine workflows. Supplied in packs of 100 pieces from manufacturer Marienfeld, these caps are intended for general laboratory material applications where a secure, reusable screw closure is required. They suit reagent bottles, sample containers and process vessels that share the GL 18 thread standard. The combination of durable polyethylene and the double-acting cone seal makes them a practical choice for everyday sealing tasks in analytical, preparative and quality-control environments without the need for additional liners or inserts.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Thread: GL 18
- Colour: Black
- Material: HDPE
- Seal type: Double-acting cone seal
- EAN: 4250317343413
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Questions about Screw cap, black,
What is this article?
Screw cap, black, is the article on this page. Luminix Health distributes Marienfeld for laboratory use. It sits in Bouchons à vis & fermetures, inside Bouchons, capuchons & fermetures, in Matériel de laboratoire.
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 Bouchons, capuchons & fermetures. The sub-category is Bouchons à vis & fermetures. The catalogue is Matériel de laboratoire.
Shelves beside this one are Bouchons en caoutchouc & silicone, Bouchons en verre à rodage, Couvercles & joints and Fermetures (autres).
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.