| 摘要 |
PROBLEM TO BE SOLVED: To obtain a glass composition for substrate resistant to break, suitable to the production of a large-sized plasma display panel and having a high glass transition point by adopting a specific composition of glass. SOLUTION: This glass composition for substrate is substantially composed of the following components in the indication of wt.%: SiO2 : 56-65, Al2 O3 : 15-23, MgO: 0-7, CaO: 0-8, MgO+CaO: 4-15, Na2 O: 0-9: K2 O: 0-11, Na2 O+K2 O: 8-less than 12, ZrO2 : 0-2. It is preferable that the composition has a degree of brittleness of less than 7,400m<-1/2> , a specific gravity of less than 2.6, a glass transition point of higher than 660 deg.C and an average coefficient of thermal expansion in a range of 60×10<-7> -75×10<-7> / deg.C at 50-350 deg.C.
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