It was originally manufactured in the former Soviet Union and was used in the making of primary mirrors for the Russian Maksutov telescopes, but since dissolution has diminished in quality.
[2] Materials of low coefficient of thermal expansion are critical in the manufacture of optical elements for telescopes.
In segmented mirror telescopes, it is desirable to have this coefficient as near zero as possible, and to have a high degree of homogeneity in the material.
The Southern African Large Telescope (SALT) selected Sitall for the manufacture of its 91 primary mirror segments by Lytkarino Optical Glass Plant.
The choice arose out of increased scientific collaboration between Russia and South Africa since 1994.