Transparent alumina (also known as polycrystalline sapphire) is an advanced ceramic material produced from high-purity alumina powder through a specialized sintering process. Compared to standard alumina, transparent alumina offers exceptional optical transmittance while retaining the inherent ceramic properties of high hardness, high rigidity, high-temperature resistance, and excellent electrical insulation — making it a critical material for optoelectronics, sensors, and high-power LED applications.

Key Properties:

• High transmittance in visible and infrared wavelengths

• High purity (99.9%+)

• Excellent hardness (Mohs ~9), superior wear resistance

• High rigidity (Young's modulus ~380 GPa), excellent structural stability

• High-temperature resistance and excellent chemical stability

• Good thermal conductivity (~25–30 W/m·K)

• Excellent electrical insulation