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項(xiàng)目 | SiO2% | Al2O3% |
| Fe2O3% | CaO+MgO% | K2O+Na2O% | 灼減 | 顏色 |
Ⅰ | ≥95 | 1.1 |
| 1.0 | 1.4 | 0.2 | 1.2 | 白色、灰白色、淺藍(lán)色 |
Ⅱ | ≥92 | 1.3 |
| 1.2 | 1.5 | 0.3 | 1.3 | |
Ⅲ | ≥90 | 1.5 |
| 1.4 | 1.8 | 0.5 | 1.5 | |
Ⅳ | ≤90 | 1.8 |
| 1.5 | 2.1 | 0.7 | 1.7 |