以高纯铝矾土为原料，在电弧炉中熔融，加入还原剂和稳定剂，延长结晶温区，使晶体充分完整生长。和普通刚玉相比具有硬度高，强度高，锋利度好等特点。
　　he high purity bauxite was used as raw material to melt in the electric arc furnace, the ucing agent and stabilizer were added to prolong the crystallization temperature zone and make the crystal grow fully and completely. Compared with common corundum, it has the characteristics of high hardness, high strength and good sharpness.