Description
The burette stopcock for 20 ml, solid straight, DURAN is a laboratory glass stopcock for use with burettes in volumetric and titration applications. It is built in a straight, solid design with NS 12,5 joint and a bore of 1,6 mm, manufactured from DURAN tubing to DIN 12541. The glass is borosilicate 3.3 under the DURAN® mark, as specified for this series. According to the manufacturer data it is intended for burettes 25 mm, aligning with the 20 ml burette stopcock designation in the product title. Supplied as 1 pc with a net weight of 0,039 kg, the unit is suitable as an original or replacement fitting on compatible burette systems in research, industrial QC and teaching laboratories. Controlled flow through the defined bore supports accurate reagent addition during analytical work. This stopcock from manufacturer Witeg matches common European joint and glassware standards, so it integrates readily into existing DURAN-based setups. The straight solid construction facilitates mounting, sealing and routine cleaning in everyday laboratory practice.
This article is part of Burettes, in Volumetric glassware.
Key features
- Pack size: 1 pc
- Configuration: Straight, solid
- Joint size: NS 12,5
- Bore: 1,6 mm
- Standard: DIN 12541
- Material: Borosilicate glass 3.3 (DURAN®)
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Questions about Stopcock for burettes straight ST 12,5
What is this article?
Stopcock for burettes straight ST 12,5 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.