硅微粉

      SiO2%             Al2O3%               Fe2O3%             CaO+MgO%             K2O+Na2O%        灼减

I      ≥92                 1.2                        1.2                        1.5                            0.2                  1.2

II     ≥90                 1.5                        1.2                        1.7                            0.3                  1.3

III    <90                  1.6                        1.5                        2.1                            0.5                  1.5