Consumables - Claisse



If you are looking for unmatched purity and outstanding physical properties, Claisse fluxes are manufactured through a unique process.


Here's why Claisse fluxes are the best on the market:

  • Consistent quality: No need to stock large quantities of flux or to recalibrate your spectrometer after each order. With Claisse, you can always expect the same high-quality flux.
  • Fused and homogeneous: Claisse borate fluxes consist of homogeneous, spherical and vitreous particles. Each particle has the same composition to avoid segregation and to ensure the analytical accuracy of your analysis. There is no need to recalibrate the instrument every time a new batch of flux is used.
  • 99.98+% pure and 99.995+% ultra pure: Our fluxes are the purest on the market! We guarantee that our pure borate fluxes contain less than 10 ppm for each of the 15 selected elements. The level of contamination for ultra pure fluxes is carefully controlled and analyzed for 30 selected elements. (A detailed certificate of analysis is supplied with each order.)
  • High density: Claisse borate fluxes are three times denser than the other fluxes on the market. They never fill more than half of the crucible, even when fusions for large 40 mm disks are performed. This eliminates all risks of overflow during agitation.
  • Anhydrous: Claisse fluxes have the lowest water content on the market (< 0.05%).
  • Non-hygroscopic: Claisse fluxes consist of spherical glassy beads, they are therefore non-hygroscopic. A major problem with absorbed humidity is the loss of accuracy in the analytical results. It is caused by the induced error on the mass of flux weighed, and it affects the sample/flux ratio.
  • Controlled granulometry: Claisse fluxes are 100% less than 500 µm and contain no dust. As a result, they do not tend to stick to the weighing pan, the funnel and the crucible wall. A controlled granulometry eliminates the segregation effect. It avoids the loss of flux and the formation of glass droplets on the wall of the crucible. It also allows better accuracy.
  • Non-wetting agents (NWAs) integrated: Fluxes are available with integrated lithium bromide (LiBr) or lithium iodide (LiI). Inconstant amount of NWAs to the melt can affect the accuracy of an analysis, using Claisse fluxes with integrated NWAs solves the issue. Claisse fluxes are easier to use; they save time because you do not have to add the NWAs separately during the fusion process.
  • Outstanding fluidity: Claisse borate fluxes are therefore easier to handle and weigh.


Sci-Lab supplies genuine Claisse lithium borate fluxes for XRF, ICP, and AA analysis. Fluxes are in-stock at our UK warehouse and can ship quickly.


Questions? Our sales team is ready to assist you.