Abstract: A thin glass substrate, as well as a method and an apparatus are provided. The glass substrate has a glass having first and second main surfaces and elongated elevations on one of the main surfaces. The elevations rise in a normal direction, have a longitudinal extent that is greater than two times a transverse extent, and have a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm. The method includes melting a glass, hot forming the glass, and adjusting a viscosity of the glass so that for the viscosity ?1 for a first stretch over a first distance of up to 1.5 m downstream of a flow rate control component and y1 indicating a second distance to a location immediately downstream the flow rate control component the equation lg ?1(y1)/dPa·s=(lg ?01/dPa·s+a1(y1)) applies.

Abstract: Thin glass substrates are provided. Also provided are methods and apparatuses for the production thereof and provides a thin glass substrate of improved optical quality. The method includes, after the melting and before a hot forming process, adjusting the viscosity of the glass that is to be formed or has at least partially been formed is in a defined manner for the thin glass substrate to be obtained. The apparatus includes a device for melting, a device for hot forming, and also a device for defined adjustment of the viscosity of the glass to be formed into a thin glass substrate, and the device for defined adjustment of the viscosity of the glass to be formed into a thin glass substrate is arranged upstream of the device for hot forming.

Abstract: A thin glass substrate, as well as a method and an apparatus are provided. The glass substrate has a glass having first and second main surfaces and elongated elevations on one of the main surfaces. The elevations rise in a normal direction, have a longitudinal extent that is greater than two times a transverse extent, and have a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm. The method includes melting a glass, hot forming the glass, and adjusting a viscosity of the glass so that for the viscosity ?1 for a first stretch over a first distance of up to 1.5 m downstream of a flow rate control component and y1 indicating a second distance to a location immediately downstream the flow rate control component the equation lg ?1(y1)/dPa·s=(lg ?01/dPa·s+a1(y1)) applies.

Abstract: A cover glass made of a glass ceramic that is silica based and has a main crystal phase of high quartz solid solution or keatite solid solution is provided. The cover glass has a stress profile with at least one inflection point at a depth of the cover glass of more than 10 ?m, a thickness from 0.1 mm to 2 mm, and a chemical tempering structure with a surface compressive stress of at least 250 MPa and at most 1500 MPa. A process for producing the cover glass is provided that includes producing a silica based green glass, hot shaping the silica based green glass, thermally treating the silica based green glass with a nucleation step and a ceramization step, and performing an ion exchange at an exchange bath temperature for a duration of time in an exchange bath.

Abstract: A cover glass is provided that includes a silica based glass ceramic with a thickness between 0.4 mm and 0.85 mm. The glass ceramic has a transmittance of more than 80% from 380 nm to 780 nm and a stress attribute selected from: an overall compressive stress (CS) of at least 250 MPa and at most 1500 MPa, a compressive stress at a depth of 30 ?m (CS30) from one of the two faces of at least 160 MPa and at most 525 MPa, a depth of the compression layer (DoCL) of at least 0.2 times the thickness and less than 0.5 times the thickness, and any combinations thereof. The glass ceramic has at least one silica based crystal phase having in a near-surface layer a unit cell volume of at least 1% by volume larger than that of a core where the crystal phase has minimum stresses.

Abstract: The invention relates to glass articles, in particular flat glasses, in the case of which the surface material has gradient material properties as a result of targeted process control which in turn lead to compressive prestressing of the surface. The invention also relates to a method for producing the glass articles and the use thereof.

Abstract: Chemically toughened glass is provided that has a depth of compressive stress for potassium of at least 4 ?m and at most 8 ?m; a compressive stress at a depth of 30 ?m due to sodium exchange of at most 200 MPa and a minimum amount of at least 90 MPa where the thickness is 0.5 mm, at least 100 MPa where the thickness is 0.55 mm, at least 110 MPa in where the thickness is 0.6 mm, at least 120 MPa where the thickness is 0.7 mm, and at least 140 MPa where the thickness is 1 mm; a ratio of sodium exchange depth, in ?m, to the thickness, in mm, that is greater than 0.130; and a normalized integral of tensile stress that is a storable tensile stress of at least 20.6 MPa and at most 30 MPa.

Abstract: A chemically toughened or chemically toughenable sheet-like glass article is provided. The glass article includes a glass with a composition having Al2O3, SiO2, Li2O, and B2O3. The glass and/or the glass article includes not more than 7 w t% of B2O3.

Abstract: The invention relates to a coated glass substrate or glass ceramic substrate with resistant, multi-functional surface properties, including a combination of anti-microbial, anti-reflective and anti-fingerprint properties, or a combination of anti-microbial, anti-reflective and anti-fingerprint properties where the substrate is chemically pre-stressed, or a combination of anti-microbial and anti-reflective properties where the substrate is chemically pre-stressed. The coated glass substrate or glass ceramic substrate exhibits a unique combination of functions which are permanently present and do not exert a negative effect on each other.

Abstract: A thermally tempered glass element is provided made of glass with two opposite faces that are under compressive stress of at least 40 MPa. The glass has a working point at which the glass has a viscosity of 104 dPa·s of at most 1350° C. The glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable (750° C.?T13)/(CTELiq?CTESol) has a value of at most 5*106 K2. The CTELiq is a coefficient of linear thermal expansion of the glass above a glass transition temperature Tg, the CTESol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C., and the T13 is a temperature at which the glass has a viscosity of 1013 dPa·s.

Abstract: A chemically prestressed or chemically prestressable, plate-shaped or disc-shaped glass article is provided. The glass article includes a glass with a composition of Al2O3, SiO2, Na2O, and Li2O and a prestressing or a prestressability in relation to the weight percent of Na2O of at least 250 MPa/g Na2O in 100 g of glass. The Na2O is present in a weight percent between at least 0.8 and at most 6.

Abstract: A plate-shaped or disc-shaped, chemically prestressed or chemically prestressable glass article is provided. The article includes a glass with a composition of SiO2, Al2O3, and Li2O; and a set-drop strength of at least 50 and up to 150, given as drop height in cm, wherein the drop height is given as the mean value of 15 samples, with the use of a sandpaper grit of 60. The glass has one or more features including: a CIL of greater than 1 N, 1.2 N, 2N, or 3 N, a DoL of at least 90 ?m, 100 ?m, 115 ?m, or 130 ?m, a content of network formers of at least 82 wt. %, and a content of alkali oxides of at most 14 wt. % or 12 wt. %.

Abstract: The invention relates to a method for producing a glass substrate for vehicle glazing, in particular for a windscreen of a vehicle, which comprises hot forming of a borosilicate glass, wherein in a hot forming section, at least during stretching of the glass (8) in the flow direction or longitudinal direction of movement of the glass (8), an aging velocity Av of the glass (8) to be hot formed does not exceed 10 mm/s and an aging velocity Av of the glass preferably does not undershoot 3 mm/s, and also relates to glass substrates for vehicle glazing produced by such method as well as to windscreen projection devices and driver assistance systems comprising such glass substrates.

Abstract: Thin glass substrates are provided. Also provided are methods and apparatuses for the production thereof and provides a thin glass substrate of improved optical quality. The method includes, after the melting and before a hot forming process, adjusting the viscosity of the glass that is to be formed or has at least partially been formed is in a defined manner for the thin glass substrate to be obtained. The apparatus includes a device for melting, a device for hot forming, and also a device for defined adjustment of the viscosity of the glass to be formed into a thin glass substrate, and the device for defined adjustment of the viscosity of the glass to be formed into a thin glass substrate is arranged upstream of the device for hot forming.

Abstract: Chemically toughened glass is provided that has a depth of compressive stress for potassium of at least 4 ?m and at most 8 ?m; a compressive stress at a depth of 30 ?m due to sodium exchange of at most 200 MPa and a minimum amount of at least 90 MPa where the thickness is 0.5 mm, at least 100 MPa where the thickness is 0.55 mm, at least 110 MPa in where the thickness is 0.6 mm, at least 120 MPa where the thickness is 0.7 mm, and at least 140 MPa where the thickness is 1 mm; a ratio of sodium exchange depth, in ?m, to the thickness, in mm, that is greater than 0.130; and a normalized integral of tensile stress that is a storable tensile stress of at least 20.6 MPa and at most 30 MPa.

Abstract: A thermally tempered glass element is provided made of glass with two opposite faces that are under compressive stress of at least 40 MPa. The glass has a working point at which the glass has a viscosity of 104 dPa·s of at most 1350° C. The glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable (750° C.?T13)/(CTELiq?CTESol) has a value of at most 5*106 K2. The CTELiq is a coefficient of linear thermal expansion of the glass above a glass transition temperature Tg, the CTESol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C., and the T13 is a temperature at which the glass has a viscosity of 1013 dPa·s.

Abstract: A thermally tempered glass element is provided made of glass with two opposite faces that are under compressive stress of at least 40 MPa. The glass has a working point at which the glass has a viscosity of 104 dPa·s of at most 1350° C. The glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable (750° C.?T13)/(CTELiq?CTESol) has a value of at most 5*106 K2. The CTELiq is a coefficient of linear thermal expansion of the glass above a glass transition temperature Tg, the CTESol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C., and the T13 is a temperature at which the glass has a viscosity of 1013 dPa·s.

Abstract: An alkali borosilicate glass is provided that includes: SiO2 70-86 wt % Al2O3 0-5 wt % B2O3 9.0-25 wt % Na2O 0.5-5.0 wt % K2O 0-1.0 wt %, and Li2O 0-1.0 wt %. The proportions of the components are chosen in such a way that the weighted crosslinking index, that is, the mean number n of constraints per atom has a value greater than 2.9.

Abstract: A thin glass substrate, as well as a method and an apparatus are provided. The glass substrate has a glass having first and second main surfaces and elongated elevations on one of the main surfaces. The elevations rise in a normal direction, have a longitudinal extent that is greater than two times a transverse extent, and have a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm. The method includes melting a glass, hot forming the glass, and adjusting a viscosity of the glass so that for the viscosity ?1 for a first stretch over a first distance of up to 1.5 m downstream of a flow rate control component and y1 indicating a second distance to a location immediately downstream the flow rate control component the equation lg ?1(y1)/dPa·s=(lg ?01/dPa·s+a1(y1)) applies.

Abstract: A thermally tempered glass element is provided made of glass with two opposite faces that are under compressive stress of at least 40 MPa. The glass has a working point at which the glass has a viscosity of 104 dPa·s of at most 1350° C. The glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable (750° C.-T13)/(CTELiq-CTEsSol) has a value of at most 5*106 K2. The CTELiq is a coefficient of linear thermal expansion of the glass above a glass transition temperature Tg, the CTESol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C., and the T13 is a temperature at which the glass has a viscosity of 1013 dPa·s.