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分子式：Al2O3
分子量：101.96
外观：白色粉末。易吸水但不潮解。溶于浓硫酸、不溶于水、醇、醚。为2性氧化物。但经加热后则难溶于酸。被熔融过的氧化铝的耐火性和硬度、都有提高。
| 杂质最高含量(指标以%计) | |
| 水中溶解物 | 0.5 |
| 灼烧失重 | 5.0 |
| 硫酸盐(SO4) | 0.05 |
| 氯化物(Cl) | 0.010 |
| 硅酸盐 | 合格 |
| 重金属(以Pb计) | 0.005 |
| 铁(Fe) | 0.01 |
| 碱金属及碱土金属(以硫酸盐计) | 0.50 |
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