A glass sheet comprising at least one etched surface having a surface roughness defined, when measured on an evaluation length of 2 mm and with a Gaussian filter of which the cut-off wavelength is 0.8 mm, by 0.02Ra0.4 microns and 5RSm30 microns. The glass sheet has excellent anti-sparkling properties together with an anti-glare effect. The texturing of the glass sheet may obtained by the process of carrying the glass sheet horizontally on a conveyor, pre-treating the surface to remove defects that may prevent subsequent uniform etching, etching the surface with aqueous solution containing hydrofluoric acid spread in an uniform layer over the surface of the sheet, maintaining the etching solution until the etching is ended, and drying the etched sheet.

The present invention relates to a chemically strengthened glass, in which CT.sub.1 and CT.sub.5 satisfy CT.sub.5/CT.sub.10.85, the CT.sub.1 satisfies CT.sub.1>38.7ln(t/1000)+48.2 [MPa] and an internal energy density rE satisfies rE23.3t/1000+15 [kJ/m.sup.2]. CS is a surface compressive stress value [MPa], (x) is a compressive stress value [MPa] at a position x in a depth direction, DOL is a compressive stress depth [m], and t is a sheet thickness [m].

The present invention relates to a chemically strengthened glass, in which CT.sub.1 and CT.sub.5 satisfy CT.sub.5/CT.sub.10.85, the CT.sub.1 satisfies CT.sub.1>38.7ln(t/1000)+48.2 [MPa] and an internal energy density rE satisfies rE23.3t/1000+15 [kJ/m.sup.2]. CS is a surface compressive stress value [MPa], (x) is a compressive stress value [MPa] at a position x in a depth direction, DOL is a compressive stress depth [m], and t is a sheet thickness [m].

A glass sheet comprising at least one etched surface having a surface roughness defined, when measured on an evaluation length of 2 mm and with a Gaussian filter of which the cut-off wavelength is 0.8 mm, by 0.02Ra0.4 microns and 5RSm30 microns. The glass sheet has excellent anti-sparkling properties together with an anti-glare effect. The texturing of the glass sheet may obtained by the process of carrying the glass sheet horizontally on a conveyor, pre-treating the surface to remove defects that may prevent subsequent uniform etching, etching the surface with aqueous solution containing hydrofluoric acid spread in an uniform layer over the surface of the sheet, maintaining the etching solution until the etching is ended, and drying the etched sheet.

The present invention relates to a chemically strengthened glass, in which CT.sub.1 and CT.sub.5 satisfy CT.sub.5/CT.sub.10.85, the CT.sub.1 satisfies CT.sub.1>38.7ln(t/1000)+48.2 [MPa] and an internal energy density rE satisfies rE23.3t/1000+15 [kJ/m.sup.2]. CS is a surface compressive stress value [MPa], (x) is a compressive stress value [MPa] at a position x in a depth direction, DOL is a compressive stress depth [m], and t is a sheet thickness [m].

The present invention relates to a chemically strengthened glass, in which CT.sub.1 and CT.sub.5 satisfy CT.sub.5/CT.sub.10.85, the CT.sub.1 satisfies CT.sub.1>38.7ln(t/1000)+48.2 [MPa] and an internal energy density rE satisfies rE23.3t/1000+15 [kJ/m.sup.2]. CS is a surface compressive stress value [MPa], (x) is a compressive stress value [MPa] at a position x in a depth direction, DOL is a compressive stress depth [m], and t is a sheet thickness [m].

Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750 C.-950 C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650 C.-875 C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.

Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750-950 C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650-875 C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.

Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750 C.-950 C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650C.-875 C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.