Light burned magnesia (MgO) is also called magnesium oxide, commonly known as diamond bituminous, light burnt powder, magnesium oxide powder. Density is 2.94 g/cm3, light yellow or white powder. The temperature of 2852 ° C, the boiling point of 3600 ° C. It is easy soluble in acid and ammonium salts, difficult to dissolve in water and ethanol. The specific surface area at a calcination temperature of 400 ° C was 180m2/g. The specific surface area at 1300 ° C is only 3 m 2/g. It is deliquescent in the air. It is a gas-hardening cementitious material.
Active magnesium oxide is also known as caustic bitter, active magnesia. It is a light burned magnesia obtained by natural magnesite ore, brucite and magnesium hydroxide Mg(OH)2 extracted from seawater or brine, calcined at a temperature of 700 to 1000 °C.