Manufacture of Silicate Glasses, Monitor-Samples for XRF

Quality control in an XRF-laboratory is based on regular drift control of your spectrometer. This is achieved with so called SUS samples (setting up samples) or drift control samples or monitor samples. These samples should be adapted as close as possible to your calibration range, often as a set of 2 samples for the low and high points of your curve. Primary requirement for a monitor sample is signal stability over time, avoidance of contamination and moisture uptake, easy storage conditions. Thus powder pellets or borate beads are not good for this purpose, glasses or ceramics are the material of choice.

We manufacture monitor samples for XRF-spectrometers, based on silicate glasses. Such samples are unique in stability with regard to long term radiation, chemical, mechanical, thermal and hygroscopic resistance. No oxidation effects, polished surface, easy to clean with water or alcohol. These are real glasses - no lithium borate beads!

Besides our regular programme of multielemental sets of 6 glasses covering >45 elements in different concentrations we produce custom made glasses for your individual analytical requirements. Let us have your element concentrations wanted. We check whether we already have produced a similar material, which we might offer you right from stock. If not, our glass maker will investigate the feasibility and make a compositional suggestion, based on the melt mix calculation. You will get a first target composition and a quotation for further discussion.

Most XRF monitor glasses are prepared as discs of ě 40mm, height approx. 5mm, optically polished on the analytical surface. Other diameters (i.e. ě 32mm) and heights as well as grinded surfaces are available, too. Delivery times, depending on melting cycles, are normally 4-6 weeks. The samples are supplied with a guiding analysis which is sufficient data for the purpose as monitor or setting up sample.

It is possible to purchase complete melts custom made, exclusively, minimum sample number is 10 samples/melt. This is of special interest to bigger companies with several production sides and the task for comparable quality control, please inquire.

Attached (as PDF-File) please find some compilation of various glass melts, produced in recent years, this is to give you an idea on the elemental ranges possible.