__115_ is a crystalline glass ceramic material with
ultra low Coefficient of thermal expansion.
SITALL __115_ is an ideal material to be used for manufacturing
of astronomical telescopes mirrors and other optical
parts that require linear dimensions and surface figure
stability at significant temperature changes.Thermal
stability of SITALL material enables the fabrication
of high precision mirrors within quicker time of treatment
process since testing measurements are able to be conducted
not waiting until thermal equilibrium is achieved.