Description
Volumetric flask 25 ml, Class A with batch certificate, NS 12/21 ground joint and hexagonal hollow stopper is a precision measuring flask for accurate volumetric work in analytical chemistry and quality control. Fabricated from borosilicate glass 3.3, the vessel delivers high resistance to chemicals and temperature changes. The brown Diffico colouration protects light-sensitive contents, while the wide-neck design (Weithals) simplifies filling, pipetting and cleaning. Class A calibration with conformity certification ensures reliable volume accuracy; each flask is identified by batch number and accompanied by a batch certificate per original pack for full traceability. The NS 12/21 joint accepts the hexagonal hollow stopper, providing a secure seal during preparation, mixing or temporary storage of solutions. Available in packs of 10 pieces from manufacturer Witeg, these flasks are ideal for preparing standards, performing dilutions and supporting titrimetric methods that require documented Class A performance. Clear markings and sturdy construction support everyday laboratory handling.
This article is part of Volumetric flasks, in Volumetric glassware.
Key features
- Pack size: 10 pc(s)
- Nominal volume: 25 ml
- Accuracy class: Class A
- Neck type: Wide neck
- Ground joint: NS 12/21
- Stopper type: Hexagonal hollow stopper
- Technical Information Sheet:
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Questions about Volumetric flasks, 25 ml, A, CC, ST 12/21,
What is this article?
Volumetric flasks, 25 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.