The melting point of the main crystal phase periclase is 2800 ℃. It starts to sublimate at 1600 ℃ in vacuum and above 2000 ℃ in reducing atmosphere. The density is greater than 3.40g/cm, the porosity is 0%~10%, the Mohs hardness is 5.5, and the resistance to alkaline slag corrosion is very strong. Periclase is usually in the form of cube, octahedron or irregular granular, and cube cleavage is complete; Linear expansion coefficient α= (14～15) × 10/℃ (0-1500 ℃), and increases with the temperature.

Thermal conductivity λ= 123.5W/(m · K) (at 100 ℃), decreases with temperature rise. The elastic modulus is 1.96 MPa. The chemical property is stable, and there is no reaction or weak reaction between it and various refractory materials except silica brick at a high temperature of 1500 ℃. The grain size of periclase increases with the increase of calcination temperature and holding time, and the slag resistance is also improved. China's Fused magnesia See the table for quality requirements of.