| abstract |
In a method for producing a glass substrate for an information recording medium through a polishing process using a slurry containing cerium oxide abrasive grains, a glass disk made of alkali aluminosilicate glass, and suppressing residual cerium oxide abrasive grains, Reduce the roughness of the main surface. A disk made of Li 2 O—Al 2 O 3 —SiO 2 glass having (SiO 2 —Al 2 O 3 ) of 62 mol% or less is traced from a cerium oxide polishing step, and a sulfuric acid concentration is 20% by mass. Cleaning is performed at a liquid temperature of 50 ° C. or higher and 100 ° C. or lower using a cleaning liquid having a hydrogen peroxide concentration of 1% by mass or more and 10% by mass or less, and then the main surface of the glass disk is colloidal silica ground. Final polishing is performed using a slurry containing grains. [Selection] Figure 1 |