| 摘要 |
A glass for a cathode ray tube which glass can be decreased in thickness and weight, a glass panel for a cathode ray tube, a cathode ray tube and methods for producing them. Strengthened glass having a high bending strength and a thick stress-strain layer, a glass for a display which is made of the strengthened glass, particularly, a glass panel for a cathode ray tube and a cathode ray tube. The glasses include (1) a glass for a cathode ray tube which is made of a chemically strengthened glass and has a Young's modulus of at least 90 GPa, (2) a glass for a cathode ray tube, which is a chemically strengthened glass from a matrix glass which contains SiO2, Al2O3, an alkali metal oxide, SrO and ZrO2 and has an Al2O3 content of more than 4% by weight but not more than 20% by weight and an SrO content of 5 to 20% by weight, and (3) a strengthened glass formed by chemical strengthening of a physically strengthened matrix glass at a temperature lower than the strain temperature of the matrix glass.
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