Tested batch by batch
Buyers qualify quartz on its impurity profile and particle size, batch after batch. That is what we measure and report.
What each Certificate of Analysis covers
Each commercial batch is tested for SiO2 and relevant impurity elements. The results are documented in a batch-specific Certificate of Analysis.
| Parameter | Reported | Why it matters |
|---|---|---|
| SiO2 | Measured per batch | The main component. For high-purity material it is usually calculated as 100% minus the measured impurities, so it depends on which impurities were measured. |
| Fe2O3 | Measured per batch | Iron tints glass and changes the fired colour of ceramics. |
| Al2O3 | Measured per batch | A common impurity in natural quartz. Some of it sits inside the crystal lattice, where processing cannot remove it. |
| TiO2 | Measured per batch | Another impurity that can sit in the lattice and limit the purity the material can reach. |
| CaO, Na2O, K2O | Measured per batch | Calcium and the alkalis change melting behaviour and high-temperature performance. |
| Other trace elements | On request, by agreed method | Needed where your process is sensitive to specific elements. |
| Moisture | Measured per batch | Affects weight, flow and drying cost. |
| Particle-size distribution | Against your specification | Decides whether a grade suits your process at all. |
The method matters as much as the result
X-ray fluorescence (XRF) is common for major oxides, but its detection limits are too high to confirm impurities at the parts-per-million level. Plasma methods, ICP-OES and ICP-MS, measure trace elements far lower.
ICP-MS assay results for our material are available to qualified buyers on request. Ask for the method and detection limit behind any figure, ours included.
Specified batch by batch
Purity varies by deposit, vein, mining area and processing route, so each batch is analysed and reported on its own Certificate of Analysis. For most industrial processes, a stable impurity profile across shipments matters more than a single high result. We agree the specification with you and hold it from shipment to shipment.
Quartz purity grades explainedSend us your specification.
Tell us the application, particle size, chemical limits, monthly volume and destination port. We reply with what we can supply consistently.