Description
Ground joint sleeve NS 45/40 is a thin-walled PTFE sleeve for sealing standard ground glass joints of nominal size NS 45/40. The 0,05 mm wall thickness allows the film to sit evenly between the male and female cones, providing a grease-free intermediate seal for laboratory glassware connections. It is supplied as one piece and is intended for use on larger joints found on reaction flasks, condensers, receivers and multi-neck apparatus in organic and preparative chemistry. The flexible PTFE material follows the ground surfaces closely, helping to reduce leakage paths while avoiding the need for joint grease in many routine setups. From manufacturer Witeg, this Schliffmanschette is part of the range of hat and collar joint sleeves used for glassware assembly and maintenance. With a net weight of 0,001 kg it remains lightweight and simple to handle during fitting or replacement. PTFE offers wide chemical resistance toward common laboratory solvents and reagents, supporting clean, residue-minimised joints. The slim profile preserves the mechanical engagement of the NS 45/40 taper, making the sleeve a practical choice for research, process development and teaching laboratories that work with interchangeable ground-joint systems.
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 45/40
- 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 45/40
What is this article?
PTFE-Sleeves ST 45/40 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.
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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.