Description
Silicone rubber gasket GL18 is a PTFE-coated sealing component matched to laboratory glassware with GL 18 screw threads. Built from silicone rubber with a PTFE coating, it delivers a flexible yet chemically more resistant sealing face for bottles, flasks and similar vessels used in everyday laboratory practice. Supplied as one piece with a net weight of 0,001 kg, the gasket serves as a replacement or spare part for GL 18 closures where consistent sealing performance is required. The PTFE layer helps limit sticking at the contact surface, while the silicone body retains the elasticity needed for repeated opening and closing cycles. Compatible with matching screw caps and bottle necks of the GL 18 standard, it falls within the septa and sealing accessories group and comes from manufacturer Witeg in Germany. The clearly specified GL 18 dimension supports correct fit on standard laboratory thread systems, allowing laboratories to maintain secure, leak-tight joints on glassware without changing vessel geometry or thread type during routine liquid handling and storage tasks.
This article is part of Bottle accessories (pouring rings, dispensers, caps), in Bottles & containers.
Key features
- Pack size: 1 pc
- Product type: Silicone rubber gasket, PTFE-coated
- Thread size: GL 18
- Country of origin: Germany
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Questions about Silicone rubber seal GL 18
What is this article?
Silicone rubber seal GL 18 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Bottle accessories (pouring rings, dispensers, caps), inside Bottles & containers, in Labware.
Bottle accessories are the pieces on the neck: a pouring ring, a dispenser seat, a cap liner, a tamper ring. They decide how the bottle delivers and whether the closure still matches after the original cap is gone.
A laboratory bottle is a closed container with a stated volume and a neck that takes a cap, a stopper or a dispenser. Borosilicate glass is the choice when the liquid is a solvent, or when the bottle will be heated or autoclaved. Polyethylene and polypropylene are the choice when the bottle must not shatter, or when hydrofluoric acid would attack glass. A narrow mouth pours. A wide mouth is for powders and for reaching the bottom. Laboratory ware of this kind is indexed under ISO laboratory glassware. Traceable volume sits with the BIPM and NIST Physical Measurement.
Which category should I open next?
The category is Bottles & containers. The sub-category is Bottle accessories (pouring rings, dispensers, caps). The catalogue is Labware.
Shelves beside this one are Laboratory glass bottles, Plastic bottles (narrow & wide mouth), Sample containers & jars, Canisters & jerrycans and Wash bottles.
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. Delivery across Europe, two to five days when in stock. 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.
