Since 1959 year LZOS mastered manufacture of crystalline glass material having ultra-low coefficient of thermal expansion - Astrositall ^® that optical and physical mechanical properties are similar to Zerodur ^® material by Schott (Germany). During all past time many tests and measurements were conducted that proves this material properties stability within time on special-purpose components.

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technical properties of Astrositall ^® ( Sitall CO - 115 M ) material

JSC 'LZOS' production facilities allow manufacturing optics starting from casting and annealing of Astrositall ^® blanks and finishing with final figuring and polishing. At present time it is widely used for high-precision astronomical mirrors fabricating by both LZOS and other companies.

Astrositall ^® is designated for items for which no any change of linear sizes and a surface figure is not permitted when a temperature is variated.

Astrositall ^® is a crystalline glass consisting of two main phases, vitreous bonding and crystals disperse-distributed in it, that are formed by special thermal treatment of glass.