Description
Rubber sleeve with turned-over rim for Büchner funnels is a laboratory sealing accessory that creates a secure interface between filter funnels and suction flasks during vacuum filtration. It offers an inner upper diameter of 23 mm and a height of 11 mm, sized specifically for 100 ml suction flasks. The turned-over rim design simplifies placement on the flask neck while maintaining contact with the funnel stem, supporting reliable vacuum conditions throughout solid-liquid separations. Supplied as one piece with a net weight of 0,007 kg, the sleeve suits routine filtration work with Filternutschen and Büchner-type glassware in chemical, analytical and preparative laboratories. Flexible rubber construction accommodates standard laboratory glassware dimensions and permits repeated mounting and removal without specialised tools. From manufacturer Witeg, this Nutschenmanschette integrates directly into conventional vacuum filtration trains used for precipitate collection, sample clarification and general wet-chemistry workflows. Its compact geometry matches typical 100 ml receiving vessels, helping laboratories maintain consistent sealing performance across successive filtration runs in research, teaching and quality-control environments where dependable funnel-to-flask connections are required.
This article is part of Büchner & filter funnels, in Funnels.
Key features
- Pack size: 1 pc
- Inner diameter (top): 23 mm
- Height: 11 mm
- Suitable for: 100 ml suction flasks
- Design: turned-over rim
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Questions about Rubber ring for filter funnels, inner
What is this article?
Rubber ring for filter funnels, inner is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Büchner & filter funnels, inside Funnels, in Labware.
A Büchner funnel is a perforated porcelain or plastic plate used with a rubber cone and vacuum to pull liquid through a filter paper. A filter funnel is the glass cone that holds a folded paper under gravity. The plate diameter decides the paper size.
A funnel guides a liquid or a powder into a narrower mouth. A filter funnel holds a paper. A Büchner funnel is the flat perforated plate used with vacuum. A separating funnel has a stopcock so two liquid layers can be run off one at a time. A dropping funnel adds a reagent slowly into a reaction. The bore and the stopcock are the parts that matter. This glassware is listed under ISO laboratory glassware.
Which category should I open next?
The category is Funnels. The sub-category is Büchner & filter funnels. The catalogue is Labware.
Shelves beside this one are Funnels (plastic, glass & steel), Dropping funnels, Separating funnels and Powder funnels.
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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We deliver across the EU, usually within 2 to 5 working days. More is on Delivery across the EU. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.
