Characteristics 

It is white powder, odorless, tasteless, non-toxic and insoluble in water, but tends to absorb moisture. Its melting point is 2045℃, and density 3.5～3.9g/cm³. It has excellent insulativity, mechanical property and chemical stability.

Applications 

Widely used as valve film, sealing ring, friction disk, structure ceramic, vacuum tube, electronic substrate, electronic ceramic, advanced refractory materials, solid oxide fuel cell, optical communications devices, filler for heat-conducting engineering plastics, raw material of manufacturing aluminium nitride by carbothermal reduction method, and so on.