按体积可以分轻质氧化镁和重质氧化镁两种。轻质体积疏松，为白色无定形粉末。

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

重质氧化镁为白色或淡黄粉末。与水易化合，露置空气中易吸收水分和二氧化碳。与溶液混合易胶凝硬化。

硅PU氧化镁可以使产品能渗透不同材质基础毛孔， 产生高强度附着力，与基础粘合。
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