... % ,among activity MgO content 65%-75% .content of carbon <5%,120 screen mesh>95%.initial setting time 40min,final setting time 7h ... .2.Solid magnesium chlorine:Mgcl2 content >45%,Nacl content<1.5 ... 4.Magnesium oxychloride cement: MgO>18%,(Te2O3+MnO2)≤0.5%,R2O3≤4%5.Additive: macromolecule polymer6.Cement vesicantB.Character of light cement1 ...