| 摘要 |
An alkali-free glass of the present invention comprises, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 11 to 20% of B2O3, less than 0.1% of As2O3, less than 0.1% of Sb2O3, and less than 0.1% of an alkali metal oxide, and has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10−7/° C.
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