Description
Volumetric flask 20 ml, class A with batch certificate, is equipped with an NS 12/21 ground joint and a hexagonal hollow stopper in amber glass. Produced from borosilicate glass 3.3, it delivers the dimensional stability and chemical resistance required for precise volumetric work in analytical chemistry. The amber glass protects light-sensitive solutions during preparation and storage. White Diffico marking ensures clear, durable readability of the graduation line. Every flask is marked with a batch number and supplied together with a batch certificate in the original packaging, confirming class A conformity. The hexagonal hollow stopper seats securely in the joint while remaining convenient to handle. Offered in packs of 10 pieces from manufacturer Witeg, these flasks support quantitative dilutions, standard preparations and routine assays in chemical, pharmaceutical and quality-control laboratories. Net weight is 0,033 kg. The combination of class A tolerance, batch documentation and light-protective amber glass makes the flask a reliable choice for regulated laboratory environments.
This article is part of Volumetric flasks, in Volumetric glassware.
Key features
- Pack size: 10 pc(s)
- Volume: 20 ml
- Accuracy class: A
- Joint size: NS 12/21
- Stopper type: Hexagonal hollow stopper
- Material: Borosilicate glass 3.3
- Technical Information Sheet:
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Questions about Volumetric flasks, 20 ml, A, CC, ST 12/21,
What is this article?
Volumetric flasks, 20 ml, 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.
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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.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.