GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE OR FOR GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS
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Apr 18, 2024
app pub date -
Dec 20, 2023
filing date -
May 16, 2018
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A glass is an amorphous oxide glass. An SiO2 content ranges from 56 mol % to 80 mol %, an Li2O content is 2.00 mol % or less, a B2O3 content ranges from 0 mol % to 4 mol %, a total content of MgO and CaO (MgO+CaO) ranges from 9 mol % to 40 mol %, and the oxide glass has a specific gravity of 2.75 g/cm3 or less, and a glass transition temperature of 650° C. or higher.
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