发明公开
EP0858974A1 GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE 失效
GLASFÜR信息AUFZEICHNUNGSTRÄGERSUBSTRATUND GLASSUBSTRAT

GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE
摘要:
Disclosed is SiO 2 -Al 2 O 3 -RO (RO = divalent metal) glass having high specific elastic modulus of 36 x 10 6 Nm/kg or more or high Young's modulus of 110 GPa or more, high transition temperature of 700°C or higher (high heat resistance). The glass exhibits excellent surface smoothness (surface roughness Ra
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