GLASZUSAMMENSETZUNGEN.

摘要

A low alkali borosilicate glass composition comprising 60 to 78 % by weight of SiO2 10 to 25 % by weight of B2O3 3.5 to 6.0 % by weight of R2O, wherein R2O represents Na2O, K2O and/or Li2O, 2.0 to 6.5 % by weight of CeO2, and 0.25 to 8.0 % by weight of Sb2O3 and/or As2O3, the percentages being based on the total weight of the glass composition. The glass compositions of the invention are suitable for use as protective covers for solar cells, especially solar cells which are used in satellites.