Brinks Gilson & Lione
Method for producing glass substrate for information storage medium, and information storage medium
For an information storage medium a glass substrate is produced in a method including the steps of: polishing a glass substrate with a polishing agent applied thereon; and subsequently, chemically strengthening a major surface of the glass substrate. The polishing agent contains cerium oxide at a purity equal to or larger than 99% by mass for CeO2/TREO, and has an alkaline earth metal content having a total mass equal to or smaller than 10 ppm by mass. The step of polishing is performed with a soft polishing pad to polish the glass substrate.
Hoya Corporation
C B G Y C
C03C B24B G11B Y10T C03C
inventional inventional inventional additional inventional
Hazuki Toshiharu
Nakae Mori