MGO% SiO2% Fe2O3% Al2O3% CaO% LOI% BD g/cm3
>93  <3.0   <1.2   <0.8  <2.0 <0.5  >3.18
>92  <3.5   <1.4   <1.0  <2.3 <0.5  >3.15
>91  <3.8   <1.5   <1.2  <2.4 <0.5  >3.15
>90  <4.0   <1.6   <1.4  <2.5 <0.5  >3.15
>89  <5.5   <2.0   <1.6  <2.5 <0.7  >3.15
>87  <7.0   <2.0   <1.7  <3.0 <0.7  >3.10

Dead-burned magnesite, also known as refractory magnesia,
is produced from the heating of magnesite or magnesium hydroxide
and is the primary component in refractory materials.