Alkali-free aluminoborosilicate glass and its use

摘要

An alkali-free aluminoborosilicate glass preferably with a thermal expansion alpha 20/300 of about 3.7 x10-6/K, an annealing temperature OKP of above 700 DEG C., a treatment temperature VA of less than 1220 DEG C., and very good chemical stability, which can be produced in a float unit and has the following composition (in % by weight based on oxide): SiO2 52-62; B2O3 4-14; Al2O3 12-20; MgO 0-8; CaO 4-11; BaO 0-2; ZnO 2-8; ZrO2 0-2; SnO2 0-2. The ratio of Al2O3/B2O3 is preferably equal to or greater than 3. The glass is especially suitable for use in display technology.