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分子式：Al2O3
分子量：101.96
外觀：白色粉末。易吸水但不潮解。溶于濃硫酸、不溶于水、醇、醚。為2性氧化物。但經加熱后則難溶于酸。被熔融過的氧化鋁的耐火性和硬度、都有提高。
| 雜質最高含量(指標以%計) | |
| 水中溶解物 | 0.5 |
| 灼燒失重 | 5.0 |
| 硫酸鹽(SO4) | 0.05 |
| 氯化物(Cl) | 0.010 |
| 硅酸鹽 | 合格 |
| 重金屬(以Pb計) | 0.005 |
| 鐵(Fe) | 0.01 |
| 堿金屬及堿土金屬(以硫酸鹽計) | 0.50 |
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