Description
18 mm polypropylene screw cap, black, with 12 mm hole (GL18) is a laboratory closure for GL18 fine-thread vials and bottles used in sample preparation and analytical workflows. The open-hole design allows septum access for injection or sampling while the screw thread provides a secure mechanical fit on matching glassware. Black polypropylene construction offers a durable, chemically resistant shell suitable for routine laboratory handling of aqueous and many organic sample matrices. Delivered as 1000 pieces per pack, the cap supports high-throughput environments that require a steady supply of uniform closures. This screw cap from manufacturer Altmann Analytik is intended for everyday laboratory use wherever GL18 neck finishes and a 12 mm centre opening are specified. Consistent 18 mm geometry helps maintain reliable sealing performance across batches of vials. The combination of polypropylene body and defined hole diameter makes the cap a practical choice for chromatography sample vials, storage bottles, and related analytical consumable setups that depend on open-top screw closures.
This article is part of Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 1000 pc(s)
- Product type: polypropylene screw cap
- Thread size: 18 mm (GL18)
- Hole diameter: 12 mm
- Colour: black
- Material: polypropylene
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about 18mm Polypropylene Screw Caps, black, 12mm hole (GL18)
What is this article?
18mm Polypropylene Screw Caps, black, 12mm hole (GL18) is the article on this page. Luminix Health distributes Altmann Analytik 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.
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.