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Mohs 9.0, second only to diamond
Refractoriness above 1900℃
Al2O3 content ≥ 99%
| Specification | Al2O3 | SiO2 | Fe2O3 | Na2O |
|---|---|---|---|---|
| 0-1mm, 1-3mm, 3-5mm | ≥99% | ≤0.1% | ≤0.1% | ≤0.4% |
| 100#-0, 200#-0, 325#-0 | ≥98.5% | ≤0.1% | ≤0.1% | ≤0.4% |



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