Hermeticity- Hermetically sealed sapphire windows exhibit a maximum leak rate of 1 X 10-9cc helium/second

Mechanical Strength- Sapphire has a burst strength many times greater than quartz or glass

Thermal Characteristics- Operating range from +500ºC to -70ºC

High Pressures- Pressures to 10,000 psi

Chemical Inertness- Sapphire is more chemically inert than glass or quartz and is not affected by acids, strong alkalis or organic solvents

Range of Frequency Transmission- Sapphire permits operation over a wide range of spectra from ultraviolet to infrared