Description
Burette valve stopcock DURAN is a lateral stopcock manufactured from DURAN tubing for controlled liquid delivery on laboratory burettes. Made of borosilicate glass 3.3 and fitted with a PTFE spindle, it provides an adjustable bore from 0 to 2,5 mm for fine regulation of flow during volumetric titration and related analytical procedures. The DURAN® glass body combines high chemical resistance with thermal stability, making the stopcock suitable for demanding wet-chemistry environments. Net weight is 0,032 kg and the component is supplied as a single piece for straightforward replacement or assembly into existing burette systems. From manufacturer Witeg, this valve stopcock is intended for chemical analysis, pharmaceutical quality control and teaching laboratories where reproducible volume control is essential. The PTFE spindle ensures smooth operation and dependable sealing against many common reagents, while the lateral design facilitates mounting on standard burette stems. Adjustable bore range supports both dropwise addition near the endpoint and faster bulk delivery earlier in the titration, improving workflow flexibility on the bench.
This article is part of Burettes, in Volumetric glassware.
Key features
- Pack size: 1 pc
- Material: borosilicate glass 3.3
- Brand glass: DURAN®
- Spindle: PTFE
- Bore: 0 - 2,5 mm
- Design: lateral valve stopcock
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Questions about Valve for burettes, DURAN
What is this article?
Valve for burettes, DURAN is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Burettes, inside Volumetric glassware, in Labware.
A burette delivers a measured volume through a stopcock, which is how a titration is read. Class A and class AS state the tolerance. The stopcock, glass or PTFE, and the volume of the burette are the choices. A dirty bore changes the delivered volume.
Volumetric glassware is glass that has been calibrated to contain or to deliver one stated volume at a reference temperature. That calibration is the whole point. Class A and class AS have a tighter tolerance than class B. A volumetric flask contains. A pipette and a burette deliver. A measuring cylinder is the coarser reading, used when the volume is not the result. The classes sit under ISO laboratory glassware. The chain back to the unit of volume is the work of the BIPM and of NIST.
Which category should I open next?
The category is Volumetric glassware. The sub-category is Burettes. The catalogue is Labware.
Shelves beside this one are Volumetric flasks, Measuring cylinders, Mixing cylinders and Volumetric accessories & certificates.
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.