Sitall is a type of glass-ceramic material that is commonly used as a substrate in various applications, including electronics and optoelectronics. Sitall is known for its high mechanical strength, high thermal stability, and low thermal expansion coefficient, making it a suitable choice for substrates in high-temperature and high-stress environments. Additionally, Sitall is an insulator, which makes it suitable for applications that require electrical insulation. Its transparency in the visible and ultraviolet regions of the spectrum, combined with its good surface quality and flatness, also make it a suitable substrate for optical applications.