Description
Cone joint DURAN (Form B) NS 14/23 is a precision-ground standard joint designed for reliable, interchangeable connections within laboratory glassware assemblies. Produced from borosilicate glass 3.3, the component offers outstanding chemical durability and thermal stability for use in distillation, extraction, reaction and vacuum systems. It features a joint size of NS 14/23 (NS 14,5/23), a tube diameter of 13 mm and a wall thickness of 1,5 mm, with an overall length of 135 mm and a net weight of 0,014 kg. These proportions yield a sturdy yet manageable piece that forms tight seals with corresponding sockets. Available as a single unit from manufacturer Rettberg, the Form B cone profile conforms to common laboratory standards and works effectively with joint grease or PTFE sleeves. The low thermal expansion of borosilicate glass 3.3 allows repeated temperature cycling without compromising integrity, which is valuable in research, quality-control and teaching environments. Accurate grinding ensures uniform taper and surface quality, minimising the force needed for assembly and lowering the chance of glass damage. This DURAN-grade ground joint fits seamlessly into both modular kits and custom-built apparatus, delivering a reusable, chemically inert connection for handling solvents, reagents and process gases under ambient or moderate vacuum conditions.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Joint size: NS 14/23
- Material: Borosilicate glass 3.3
- Tube diameter: 13 mm
- Length: 135 mm
- Wall thickness: 1,5 mm
- Technical Information Sheet:
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Questions about Joint cone/DURAN (shape B) size 14/23
What is this article?
Joint cone/DURAN (shape B) size 14/23 is the article on this page. Luminix Health distributes Rettberg 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.