氧化镁Mgo≥             99.8             99.5              99.2             99.0               99
氧化Ca≤                 0.001          0.003             0.003           0.005            0.01
盐≤                      0.03            0.05               0.05             0.06             0.05
铁Fe≤                        0.001          0.005             0.005           0.008            0.02
化物Cl≤                  0.003          0.003             0.003           0.005            0.02
氧化铝Al0≤                0.001          0.002              0.03             0.05             0.06
酸不溶≤                       0.1             0.1                  0.1               0.1               0.1
白度≤                           93              93                  92                90                90
密度g/ml≤                 3.58            3.58               3.58              3.5               3.58

轻质氧化镁熔点为2852℃，沸点3600℃。

我厂生产的高纯电熔氧化镁，采用纯碱和卤水合成高纯氧化镁，再经电熔，制取高纯度、高密度和低硼的电熔氧化镁，其指标达到和超过日本同类型牌号SSP3的水平。

氧化镁（MgO）俗称苦土，也称氧，是的氧化物，一种离子化合物。常温下为一种白色固体。氧化镁以方石形式存在于自然界中，是冶的原料。
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