Quartz glass has a very high dielectric strength but a very low electric conductivity, even at high temperature, high voltage and high frequency, nearly without electric loss in the range of the frequencies applied. Therefore quartz glass is an excellent high temperature dielectric material. 

Far ultraviolet optical quartz glass: Using wave band from 185nm to 2500nm. There isn't absorbent peak within this range. Transmission more than 80% at 185nm. 

Ultraviolet optical quartz glass: Using wave band from 220nm to 2500nm. There is absorbent peak at 2730nm. 

Infrared optical quartz glass: Using wave band from 260nm to 3500nm.