Description
NS ground joint sleeve NS 34/35 PTFE is a laboratory sealing sleeve for standard conical ground glass joints. Made from PTFE and 0,4 mm thick, it incorporates a grip collar that simplifies placement and removal on NS 34/35 joints without damaging the glass surface. The PTFE construction offers broad chemical resistance and a low-friction interface, supporting grease-free or low-grease seals in synthesis, distillation, extraction, and general apparatus work. This sleeve from manufacturer Witeg helps protect joint surfaces, improve alignment, and maintain reproducible connections between flasks, condensers, adapters, and other ground-joint components. Supplied as one piece with a net weight of 0,006 kg, it suits routine laboratory glassware assemblies where a durable collar-style manschette is preferred. Use it wherever NS 34/35 joints require a reliable PTFE intermediate layer for sealing and mechanical protection during repeated assembly cycles.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Material: PTFE
- Joint size: NS 34/35
- Wall thickness: 0,4 mm
- Design: With grip collar
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Distillation & extraction glassware
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Distillation heads, adapters & columns
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Questions about ST-sleeve for joints ST34/35 PTFE
What is this article?
ST-sleeve for joints ST34/35 PTFE 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.