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Chemical Analysis Reports and Quality Control
A COA can be supplied for both grades. Agree the acceptance limits before the order is confirmed.
| Item | A Grade | B Grade |
|---|---|---|
| SiO₂ | 99.9% min | 99.8% min grains; 99.7% min powder |
| Fe₂O₃ | ≤ 100 ppm | ≤ 200 ppm |
| Al₂O₃ | ≤ 200 ppm | ≤ 200 ppm |
| Na₂O | ≤ 100 ppm | ≤ 200 ppm |
| K₂O | ≤ 100 ppm | ≤ 100 ppm |
| MgO | ≤ 200 ppm | ≤ 200 ppm |
| CaO | ≤ 100 ppm | ≤ 100 ppm |
| Magnetic impurities | ≤ 50 ppm | ≤ 100 ppm |
These are typical values from the product data. Chemical composition, particle size and other limits are confirmed on the COA and the quotation before the order.
A chemical analysis report can be supplied for both A grade and B grade. Please request the report for the mesh size you are evaluating. Acceptance limits should be agreed before the order is confirmed.
What to include in your inquiry
- Grade: A grade or B grade
- Form: sand, grains or powder
- Target particle size or mesh range
- SiO₂ target and impurity limits, if you have them
- Application and any technical specification
- Estimated quantity and destination country