Display panel glass of cathode ray tube

The present invention provides a novel glass composition of the high voltage which is suitable projection cathode-ray tube, a large current, the occurrence of the display panel of glass without devitrification suppression problem on a practical level, while ensuring a sufficient X-ray absorption capacity and greatly improve the browning characteristics. It does not substantially contain PbO, contains more than 10 mass%, 15 mass% or less of ZnO, (MgO (mass%) + ZnO (mass%)) / (SrO (mass%) + BaO (mass%) + CaO (mass%))> 0.55,0.15≤Na