Use of a transparent plate pocket in the form of a glazing for viewing window in space stations, missiles, as well as polar tat ions in arctic and antarctic wide

摘要

Use of a transparent plate pocket with an outer glass ceramic plate, which– at least on the side facing the environment has a pore-free surface,– a surface structure with a roughness, determined by the mean roughness value r_a ≤ 0,02 μm and / or the quadratic mean roughness value r_q ≤ 0,01 μm,– from a thermally prestressable, floated aluminosilicate glass with a content of less than 300 ppb of pt, less than 30 ppb of rh, less than 1,5 w -% zno and less than 1 w -% sno₂ is made, in the case of the melt without the use of the usual fining agent arsenic - and / or antimony oxide is refined and the glass in a glass ceramic with - high quartz mixed crystals or - keatite mixed crystals is converted,as a glazing for viewing window in space stations, missiles, as well as polar tat ions in arctic and antarctic wide.