Description
Ground joint sleeve NS 19/26 is a thin PTFE sealing sleeve designed for common laboratory ground glass joints of NS 19/26 size. With a wall thickness of 0,05 mm and a grooved surface, it forms a flexible, chemically resistant layer between the male and female cones, enhancing seal quality and reducing the tendency of joints to seize under vacuum, heat, or solvent exposure. The low-profile construction preserves joint geometry while supporting reliable liquid- and vacuum-tight connections in distillation trains, reaction vessels, and multi-piece glassware assemblies. Packaged as a single piece with a net weight of 0,003 kg, the sleeve is suitable for organic synthesis, purification, and analytical workflows. Grooves assist even seating and facilitate insertion or withdrawal during apparatus assembly and cleaning. From manufacturer Witeg, this PTFE accessory matches standard European ground-joint dimensions and is intended for routine use in research, teaching, and industrial laboratories that require dependable, reusable sealing of NS 19/26 joints with minimal grease.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Product type: Ground joint sleeve
- Joint size: NS 19/26
- Material: PTFE
- Wall thickness: 0,05 mm
- Surface: grooved
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Distillation & extraction glassware
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Distillation heads, adapters & columns
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Questions about Sleeves ST 19/26
What is this article?
Sleeves ST 19/26 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Distillation heads, adapters & columns, inside Distillation & extraction glassware, in Labware.
A still head, an adapter or a column is the glass between the boiling flask and the condenser. A Vigreux or packed column gives the vapour a surface so a closer-boiling mixture can separate. The joint sizes at both ends have to match the flask and the condenser.
Distillation separates liquids by boiling point. A condenser turns the vapour back into liquid: Liebig, coil and cold-finger shapes differ in how much cooling surface they offer. A still head and a column sit between the flask and the condenser. A Soxhlet extractor washes a solid again and again with the same solvent. Ground joints have a standard size, and the joint, not the flask, is what has to match. The pieces are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Distillation & extraction glassware. The sub-category is Distillation heads, adapters & columns. The catalogue is Labware.
Shelves beside this one are Condensers, Ground-joint glassware (other) and Soxhlet & extraction apparatus.
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.