Description
Volumetric flask 20 ml, DIN Class A, NS 12/21 ground joint and hexagonal hollow stopper is a precision laboratory vessel designed for accurate preparation of standard and sample solutions. Produced from borosilicate glass 3.3, it offers outstanding chemical durability and thermal shock resistance for daily analytical work. The blue Diffico finish distinguishes the flask visually while the Class A conformity certification guarantees high volumetric accuracy. Every flask is marked with a batch number and delivered with a batch certificate inside the original packaging, ensuring complete documentation and traceability. The NS 12/21 joint pairs with the hexagonal hollow stopper to provide a secure, leak-resistant closure during shaking, dilution or short-term storage. Supplied in packs of 10 pieces from manufacturer Witeg, these flasks support titration, calibration and quantitative analysis tasks that demand certified Class A performance. Clear graduation and robust construction make them practical for routine laboratory use and repeated cleaning cycles.
This article is part of Volumetric flasks, in Volumetric glassware.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 20 ml
- Accuracy class: DIN Class A
- Ground joint: NS 12/21
- Stopper type: Hexagonal hollow stopper
- Material: Borosilicate glass 3.3
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Questions about Volumetric flasks, 20 ml, class A, CC, ST 12/21,
What is this article?
Volumetric flasks, 20 ml, class A, CC, ST 12/21, is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Volumetric flasks, inside Volumetric glassware, in Labware.
A volumetric flask is calibrated to contain one volume at a reference temperature, with a single mark on a narrow neck. Class A is the tight tolerance. It is not a storage bottle and it is not for heating. The stopper is part of the calibrated article.
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 Volumetric flasks. The catalogue is Labware.
Shelves beside this one are Measuring cylinders, Burettes, 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.