Description
HV plane flange 25 mm is a fire-polished laboratory component with sealing bed for high-vacuum glass apparatus and vacuum line assemblies. The plane flange delivers a flat mating surface suited to gasketed HV connections in research, analytical, and general laboratory glass systems. At 25 mm, it offers a larger sealing diameter for medium-scale apparatus where a stable, uniform joint face supports vacuum integrity. The fire-polished finish promotes a smooth sealing interface, limiting surface irregularities that could affect leak-tight performance. An integrated sealing bed accommodates appropriate sealing media for reliable plane-flange joints under high-vacuum conditions. Each flange is supplied as 1 pc with a net weight of 0,088 kg and a matching gross weight of 0,088 kg, facilitating straightforward stocking and system integration. From manufacturer Witeg, this item forms part of the plane flange category used in laboratory vacuum technology. Originating from Germany (Baden-Württemberg), it is intended for flexible configuration of HV glassware setups that require a dedicated 25 mm plane flange with sealing bed for clean, dependable connections.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: HV plane flange
- Diameter: 25 mm
- Finish: Fire-polished
- Design: With sealing bed
Recently viewed
You may also like
Questions about HV-flat flange, 25 mm, fire polished, w
What is this article?
HV-flat flange, 25 mm, fire polished, w is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Hose connectors, adapters & fittings, inside Tubing, hoses & fittings, in Labware.
A hose connector or adapter joins two lines, or steps one bore down to another. The barb diameter has to match the tube, and the thread has to match the stopcock or the bottle. Most leaks are a mismatch here, not a hole in the tube.
Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.
Which category should I open next?
The category is Tubing, hoses & fittings. The sub-category is Hose connectors, adapters & fittings. The catalogue is Labware.
Shelves beside this one are PVC, PTFE & other tubing, Stopcocks & valves, Silicone tubing and Tubing accessories.
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.


