Description
Volumetric flask 20 ml, Class A with batch certificate, NS 12/21 ground joint and hexagonal hollow stopper is a precision measuring vessel for accurate volume preparation in analytical and quality-control laboratories. Manufactured from borosilicate glass 3.3, the flask combines high chemical resistance with excellent thermal stability for routine and demanding workflows. The brown Diffico finish provides light protection for photosensitive solutions while the wide-tolerance Class A calibration ensures reliable volumetric accuracy. Each flask carries a batch number and is supplied with a batch certificate enclosed in the original packaging, supporting full traceability. The NS 12/21 joint accepts the matching hexagonal hollow stopper for secure closure during mixing, dilution or storage. Offered in packs of 10 pieces from manufacturer Witeg, these flasks are well suited for preparing standard solutions, titrations and sample dilutions where certified Class A performance and batch documentation are required. The robust construction and clear graduation mark facilitate everyday laboratory handling and cleaning.
This article is part of Volumetric flasks, in Volumetric glassware.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 20 ml
- Accuracy class: Class A
- Ground joint: 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 Fioles jaugées, inside Verrerie volumétrique, in Matériel de laboratoire.
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 Verrerie volumétrique. The sub-category is Fioles jaugées. The catalogue is Matériel de laboratoire.
Shelves beside this one are Éprouvettes graduées, Burettes, Éprouvettes de mélange and Accessoires volumétriques & certificats.
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.