Fused quartz is produced by fusion at very high temperatures of naturally occurring high purity quartz rock crystal. Flame fused quartz has very good transmission at near ultraviolet and visible wavelengths with useful transmission range form 260nm to above 200nm. Fused quartz polished windows are made from a range of quartz grades available which are dependent upon visual quality required and transmission.

Fused quartz polished windows are manufactured from a range of grades of materials from major quartz processors from around the world.