Description
Cone with extension DURAN (Form G) NS 19/26 is a precision-ground laboratory glass joint with an extended tube for modular chemical apparatus. This Form G cone is produced from borosilicate glass 3.3, combining chemical durability, low thermal expansion, and mechanical strength for everyday laboratory use. The joint size is NS 19/26, with a tube diameter of 17 mm, a wall thickness of 1,8 mm, and an overall length of 135 mm, making it suitable for mid-size distillation, reaction, and vacuum glassware configurations. Net weight is 0,026 kg per piece. Supplied as a single unit, the extended cone supports standardized Normschliff connections and helps achieve leak-resistant, interchangeable fittings in DURAN-compatible systems. Manufactured by Rettberg, the component is intended for research, analytical, and teaching laboratories that rely on reproducible ground-joint geometry. Its borosilicate construction and defined dimensions aid dimensional stability during thermal cycling and routine assembly work, providing a practical building block for custom glass setups requiring an NS 19/26 cone with extension.
This article belongs on Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Joint size: NS 19/26
- Material: Borosilicate glass 3.3
- Tube diameter: 17 mm
- Length: 135 mm
- Wall thickness: 1,8 mm
- Technical Information Sheet:
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Questions about Cone/ext./DURAN (shape G) size 19/26
What is this article?
Cone/ext./DURAN (shape G) size 19/26 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 Matériel de laboratoire.
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 Matériel de laboratoire.
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.
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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.