Protected aluminum mirrors are first coated with aluminum, then protected with silicon monoxide. The mirrors are usable from 400 nm to the far infrared. The reflectance is typically above 88% in the visible and above 96% in the far infrared. These mirrors are hard and durable. They meet all requirements of MIL-M-13508. The graph above shows Percent Reflection vs. Wavelength – microns, ranging from 0.3 to 1.0 µm, with reflectance around 88–90% in the visible region.
