Glass for television display cathode-ray tubes

摘要

Glass for the envelope of television display cathode-ray tubes, particularly for the face plate of a colour display tube and having a composition in % by weight within the range limited as follows: }SiO2 54-69 }Na2O 6-10 } [Na2O] + [K2O] combined 14-20 }K2O 5-10 }CaO 0- 4 }MgO 0-2.5 }Al2O3 0- 6 } [Al2O3] + [ZrO2] < 6 }ZrO2 0- 6 }BaO 8-18 2 [ZrO2] + [BaO] + [ZnO] + } 4 [Sb2O3] > 20 }ZnO 0- 5 [ZrO2] + [ZnO] + [Sb2O3] > 3 }CeO2 0.05-0.3 }Sb2O3 0- 3 } [Sb2O3] + [As2O3] >/= 0.3 }As2O3 0-0.3 }