Description
Ground joint sleeve NS 12/21 is a PTFE sleeve for standard conical ground joints of size NS 12/21, supplied for laboratory glassware assemblies. Wall thickness is 0,05 mm, giving a thin film profile suited to fitting between matching male and female ground surfaces. The sleeve is listed among ground joint sleeves, hat sleeves, collar sleeves and collar seals used to complete NS taper connections on flasks, condensers, adapters and related apparatus. Pack size is 1 pc, with a net weight of 0,001 kg and a gross weight of 0,001 kg. This PTFE ground joint sleeve from manufacturer Witeg originates in Germany (Baden-Württemberg) and carries UNSPSC classification 41104812. The NS 12/21 designation follows the common European standard taper series, so the sleeve aligns with glassware already marked for that joint size. As a simple PTFE manschette it serves as a dedicated sealing accessory within the broader range of laboratory joint sleeves and collar-type seals for routine chemical and analytical work.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Joint size: NS 12/21
- Material: PTFE
- Wall thickness: 0,05 mm
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Distillation & extraction glassware
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Distillation heads, adapters & columns
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Questions about PTFE-Sleeves ST 12/21
What is this article?
PTFE-Sleeves ST 12/21 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.