The specific requirements for optical components for complex applications in industry and science are particularly high. We recommend Infrasil and Suprasil glasses because of their excellent physical and optical properties. Some of the elementary parameters required here include homogeneity with minimal distortion (light transmission in the functional direction), excellent transmission, an optimum coefficient of thermal expansion and other mechanical, thermal or chemical characteristics as described above. In high-tech environments where these parameters and outstanding optical performance are essential, Suprasil or Infrasil quartz glass is the first choice for the manufacture of lenses, windows, filters or precision mirrors (scanners, deflection mirrors).