| 摘要 |
PROBLEM TO BE SOLVED: To provide glass which has low softening point, is easily press formed at a low temperature capable of forming precise surface following the press mold, is capable of approximating its coefficient of thermal expansion to that of the press mold without getting out of shape, has low transition temperature, is capable of exchanging alkalline ion at a low temperature, and is highly strengthened chemically. SOLUTION: This is lithium-sodium-alminosilicate glass for a press formed article which is press formed of glass in a thermally softened state and chemically toughened by exchanging alkalline ion of that article, where the softening point is 700 deg.C or lower, the transition point is 481 deg.C or lower, and the coefficient of thermal expansion between 30 deg.C and the transition point is 100 to 130 (×10-7/ deg.C).
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