Abstract: Provided is a method for manufacturing a glass substrate for an information recording medium, which is advantageous in that oozing of an alkali and deformation of a texture are suppressed. The glass substrate is chemically reinforced, and a texture is formed in the glass substrate, and then treated with a neutral or alkaline aqueous solution. In the texture forming step, the surface of the glass substrate is etched in a depth of 0.5 to 10 nm.

Abstract: A method for manufacturing a disk-like glass substrate that is used as an information recording medium. The glass substrate is acid resistant. When an index of acid resistance is the maximum depth at which components other than silica dissolve from the glass substrate during immersion of the glass substrate in 1 percentage of weight of sulfuric acid, the acid resistance of the glass substrate is represented by the maximum depth of 0.5 nm to 10 nm. A linear texture is formed by pressing a tape against the glass substrate in a circumferential direction of the glass substrate while feeding abrasion slurry to the surface of the glass substrate. Acid treatment is performed on the glass substrate on which the texture is formed.

Abstract: There are provided a glass substrate for information recording media in which the undulations on the glass substrate surface are optimized, thus contributing to reduction of the flying height, and at the same time preventing the occurrence of head crashes and thermal asperity, and a method of manufacturing the glass substrate. At least one surface of a glass substrate is polished, and the polished at least one surface of the glass substrate is subjected to surface scrubbing using a sponge having an Asker C hardness of not less than 40 according to The Society of Rubber Industry, Japan SRIS 0101.

Abstract: A method for manufacturing a disk-like glass substrate that is used as an information recording medium. The glass substrate is acid resistant. When an index of acid resistance is the maximum depth at which components other than silica dissolve from the glass substrate during immersion of the glass substrate in 1 percentage of weight of sulfuric acid, the acid resistance of the glass substrate is represented by the maximum depth of 0.5 nm to 10 nm. A linear texture is formed by pressing a tape against the glass substrate in a circumferential direction of the glass substrate while feeding abrasion slurry to the surface of the glass substrate. Acid treatment is performed on the glass substrate on which the texture is formed.

Abstract: Provided is a method for manufacturing a glass substrate for an information recording medium, which is advantageous in that oozing of an alkali and deformation of a texture are suppressed. The glass substrate is chemically reinforced, and a texture is formed in the glass substrate, and then treated with a neutral or alkaline aqueous solution. In the texture forming step, the surface of the glass substrate is etched in a depth of 0.5 to 10 nm.

Abstract: A method for manufacturing an information recording medium glass substrate that prevents a glass plate from drying and prevents material from collecting on the surface when the glass plate is transferred. The method includes immersing the glass plate in a heated chemical strengthening liquid, washing the glass plate with warm water to remove adhered material from the surface of the glass plate, washing the glass plate to remove residual adhered material from the surface of the glass plate, and transferring the glass plate from a location at which the warm water washing is performed to a location at which the washing is performed by wetting or moistening the glass plate with liquid.

Abstract: A substrate for information recording media is disclosed which has optimized shapes of surface recesses and protrusions and thereby contributes to a reduction in flying height and causes neither head crushing nor thermal asperities. The substrate for information recording media has surface recesses and protrusions wherein the height thereof at a contact proportion for the recesses and protrusions of 0.4% is from 2 to 7 nm when the height of the recesses and protrusions at a contact proportion therefor of 50% is taken as a base. The contact proportion is a value based on the bearing ratio determined with an atomic force microscope.

Abstract: There are provided a glass substrate for information recording media in which the undulations on the glass substrate surface are optimized, thus contributing to reduction of the flying height, and at the same time preventing the occurrence of head crashes and thermal asperity, and a method of manufacturing the glass substrate. At least one surface of a glass substrate is polished, and the polished at least one surface of the glass substrate is subjected to surface scrubbing using a sponge having an Asker C hardness of not less than 40 according to The Society of Rubber Industry, Japan SRIS 0101.