Description
Screw cap GL 18 made of polybutylene terephthalate (PBT) is designed for tubing and pipe feed-throughs with an outer diameter of 3,2 mm. It incorporates a PTFE inner part that creates a chemically resistant sealing interface around the inserted line. This laboratory screw closure from manufacturer Rettberg matches GL 18 threaded necks widely used on glassware and process vessels. The PBT body provides mechanical strength for everyday handling, while the PTFE insert helps maintain a dependable seal when routing medium-diameter tubing or pipe into a closed system. Net weight is 0,010 kg, making the compact part practical as a spare or replacement. It supports secure connection of 3,2 mm outer-diameter lines in many standard laboratory configurations. Typical applications include chromatography accessories, synthesis work-up and general liquid transfer where media must pass through a sealed vessel port. The combination of PBT and PTFE addresses structural stability and chemical resistance for routine laboratory fluid handling without unnecessary bulk in the assembly.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Thread: GL 18
- Material: Polybutylene terephthalate (PBT)
- Inner part: PTFE
- Tubing outer diameter: 3,2 mm
- Technical Information Sheet:
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Questions about Screw cap GL 18 from PBT, for tube leadthrough outer-Ø 3,2 mm
What is this article?
Screw cap GL 18 from PBT, for tube leadthrough outer-Ø 3,2 mm is the article on this page. Luminix Health distributes Rettberg 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. 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.