A glass sheet has one surface and the other surface facing the one surface in a thickness direction, wherein a fluorine concentration (average fluorine concentration by SIMS at a depth of 1 to 24 m) in the one surface is higher than that in the other surface. The following expression is satisfied: 0.07F/H.sub.2O. F (mol %) is a value obtained by subtracting an average fluorine concentration in the surface having the lower fluorine concentration from that in the surface having the higher fluorine concentration, and H.sub.2O (mol %) is an absolute value of a value obtained by subtracting an average H.sub.2O concentration in the surface having the higher fluorine concentration from that in the surface having the lower fluorine concentration.

Provided is a coating-attached glass article including: a glass substrate; and an easy-to-clean coating on the glass substrate, wherein the coating includes zirconium oxide, and a contact angle of water on a surface of the coating is 60 or more and 130 or less. For the glass article, an absolute value of a difference between visible transmittances is 0.7% or less, the visible transmittances being determined before and after an abrasion resistance test performed for the coating in accordance with an abrasion resistance test in EN 1096-2: 2001 under a condition of 500 strokes except that Grade No. 0000 steel wool is used instead of a felt pad.

Provided is a coating-attached glass article including: a glass substrate; an easy-to-clean coating on the glass substrate; and a diffusion prevention layer between the glass substrate and the coating. Moreover, a coating-attached glass article is provided, the coating-attached glass article including: a glass substrate; and an easy-to-clean coating on the glass substrate, wherein the glass substrate includes a dealkalized layer in a surface on the coating side. In each of the glass articles, a sum of a content of a Group 1 element and a content of a Group 2 element in a surface of the coating on the glass substrate side is 5 atm % or less.

A glass glass-ceramic composite comprises a substrate comprising an alkali-containing glass bulk, the bulk comprising Al.sub.2O.sub.3 and SiO.sub.2 and alkali, and a glass-ceramic surface layer, the surface layer comprising an alkali-depleted glass ceramic comprising Al.sub.2O.sub.3 and SiO.sub.2 with at least 5% crystalline phase by volume, wherein the alkali-depleted glass ceramic surface layer comprises a mol % Al.sub.2O.sub.3 of at least 51%. A method of preparing the composite is also disclosed.

Embodiments of a glass substrate including an alkali-containing bulk and an alkali-depleted surface layer, including a substantially homogenous composition with at least 51 mol % Al.sub.2O.sub.3 are disclosed. In some embodiments, the alkali-depleted surface layer includes about 0.5 atomic % alkali or less. The alkali-depleted surface layer can be substantially free of hydrogen and/or crystallites. Methods for forming a glass substrate with a modified surface layer are also provided.

Disclosed herein are embodiments of a color glass panel. The color glass panel includes a glass body having a first major surface and a second major surface opposite the first major surface. The glass body is made from an alkali aluminosilicate glass composition containing Li.sub.2O. At least one of the first major surface or the second major surface has a length and a width, and the length and width define an area. A ratio of a spodumene crystal area of spodumene crystals to the area is 2% or less. Further, a transmittance through the glass panel from the first major surface to the second major surface is less than about 92% for at least one wavelength in a range from about 380 nm to about 750 nm.

Embodiments of a glass substrate including an alkali-containing bulk and an alkali-depleted surface layer, including a substantially homogenous composition with at least 51 mol % Al.sub.2O.sub.3 are disclosed. In some embodiments, the alkali-depleted surface layer includes about 0.5 atomic % alkali or less. The alkali-depleted surface layer can be substantially free of hydrogen and/or crystallites. Methods for forming a glass substrate with a modified surface layer are also provided.

A glass container includes a glass body comprising an external surface, an internal surface opposite the external surface, a thickness T extending between the external surface and the internal surface, and an external surface layer extending from the external surface into the thickness of the glass body, wherein the external surface layer has a porosity greater than a porosity of a remainder of the glass body extending from the external surface layer to the internal surface.

The invention relates to a method for dealkalisation of the inside surface (5) of the wall (2) of a glass container (1), which wall (2) defines a cavity (3) and an opening (4) providing access to the cavity (3), the method comprising a step of providing a container made of borosilicate glass, wherein the inside surface of the wall is at a temperature of at least 350 C., and a step of introducing into the cavity, the inside surface being at a temperature of at least 350 C., a treatment liquid containing a substance designed to react under the effect of heat to cause dealkalisation of the glass. Methods for treating glass containers.

A glass container includes a glass body comprising an external surface, an internal surface opposite the external surface, a thickness T extending between the external surface and the internal surface, and an external surface layer extending from the external surface into the thickness of the glass body, wherein the external surface layer has a porosity greater than a porosity of a remainder of the glass body extending from the external surface layer to the internal surface.