Description
Silicone seals Ø GL 18 are piercable sealing discs intended for GL 18 threaded laboratory connections. Made of silicone, each seal permits needle penetration while providing a dependable closure on GL 18 screw threads. They are suited to laboratory operations that require repeated access to vessel contents—such as sampling, reagent introduction or controlled gas exchange—without dismantling the joint. Supplied by manufacturer Witeg in packs of 10 pieces, the seals support everyday laboratory workflows and convenient stock replenishment. Individual net weight is 0,001 kg, ensuring a compact, lightweight component that fits standard GL 18 threads. These piercable silicone seals offer a practical elastomer interface for analytical and preparative glassware systems where a soft, resealable closure is needed. Ideal for routine sealing tasks on GL 18 apparatus, they deliver a straightforward solution for laboratories working with threaded joints of this size.
This article is part of Vial caps & septa, in Vials, caps & septa.
Key features
- Pack size: 10 pc(s)
- Thread size: GL 18
- Material: silicone
- Type: piercable seals
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Questions about Silicone rubber seals Ø: GL 18
What is this article?
Silicone rubber seals Ø: GL 18 is the article on this page. Luminix Health distributes Witeg 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.