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Light fired magnesia primer (MgO) scientific name magnesium oxide, commonly known as diamond bitter soil, light fired powder primer, magnesia oxide powder. Density 2.94, light yellow or white powder. Melting point 2852℃, boiling point 3600℃. Soluble in acid and ammonium salts, insoluble in water and ethanol. The specific surface area is 180m2/g when the calcination temperature is 400℃. At 1300℃, the specific surface area is only 3m2/g. It is easily deliquescent in air. It belongs to the gas-hard cementing material.
Light burning magnesia also known as caustic soil, active magnesia. It is a kind of light fired magnesium oxide obtained from natural magnesite, brucite and magnesium hydroxide Mg(OH)2 extracted from sea water or brine by calcination at 700~1000℃.