Abstract: The present invention relates to a base material that comes into contact with water and contains a base material main body and a surface layer provided on at least a part of a surface that comes into contact with water of the base material main body, (1) in which the surface layer is composed of a cured product of a composition containing a compound having a biocompatible moiety and a reactive silyl group, the biocompatible moiety has a specific structure, the composition has a content of the biocompatible moiety being 25 to 83% by mass and a content of the reactive silyl group being 2 to 70% by mass, in a solid component, or (2) in which the surface layer has an elastic modulus showing a measured value in water being 0.1% to 63% with respect to a measured value after drying in the air.

Abstract: A glass substrate includes at least one selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba and Zn as a reaction factor component, and includes a surface depletion layer at a surface side of the glass substrate. A total molar concentration (mol/cm3) of the reaction factor component in the surface depletion layer is decreased relative to an inside of the glass substrate. A total depletion amount (mol/cm2) of the reaction factor component in the surface depletion layer is 1.00×10?8 or more. The glass substrate has a refractive index (nd) of 1.68 or more.

Abstract: A glass substrate includes at least one selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba and Zn as a reaction factor component, and includes a surface depletion layer at a surface side of the glass substrate. A total molar concentration (mol/cm3) of the reaction factor component in the surface depletion layer is decreased relative to an inside of the glass substrate. A total depletion amount (mol/cm2) of the reaction factor component in the surface depletion layer is 1.00×10?8 or more. The glass substrate has a refractive index (nd) of 1.68 or more.

Abstract: A float glass for chemical strengthening, having a bottom surface to contact a molten metal during molding and a top surface facing the bottom surface. An absolute value of a difference between a normalized hydrogen concentration at a depth of 5 to 10 ?m that is a value obtained by dividing a hydrogen concentration at a depth of 5 to 10 ?m by a hydrogen concentration at a depth of 50 to 55 ?m in the top surface and the normalized hydrogen concentration at a depth of 5 to 10 ?m in the bottom surface is 0.35 or less.

Abstract: A float glass for chemical strengthening, having a bottom surface to contact a molten metal during molding and a top surface facing the bottom surface. An absolute value of a difference between a normalized hydrogen concentration at a depth of 5 to 10 ?m that is a value obtained by dividing a hydrogen concentration at a depth of 5 to 10 ?m by a hydrogen concentration at a depth of 50 to 55 ?m in the top surface and the normalized hydrogen concentration at a depth of 5 to 10 ?m in the bottom surface is 0.35 or less.