Synthetic sapphire is a single crystal form of corundum, AI2O3. Sapphire is aluminum oxide in purest form with no
porosity or grain boundaries, making it theoretically dense. The combination of favorable chemical, electrical,
mechanical, optical, surface, thermal, and durability properties make sapphire the preferred material for high
performance system and component designs. For various semiconductor applications sapphire is the best
choice in the comparison with other synthetic single crystals.