A porous alumina ceramic of 99.7% Al₂O₃ content, used extensively for long-life laser reflectors.

This material is sintered at high temperatures to achieve a controlled porosity.

Prime features

• Surfaces can be sealed and coated with a solarization-resistant glaze to give high bulk refectivity

• 97.8% reflectance efficiency at 1000nm

• Reflectance efficiency exceeds 96% across the wavelength range 500-2000nm (see curve)

• Controlled porosity

• Good thermal conductivity

• High electrical resistivity