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.

A method of manufacturing a quartz glass fibre includes producing a quartz glass primary preform by modified chemical vapor deposition (MCVD) in a quartz glass substrate tube and inserting the quartz glass primary preform into a glass jacketing tube. Defect-generating UV radiation is irradiated into the cross-sectional area of the glass jacketing tube while combining the quartz glass primary preform with the glass jacketing tube in the jacketing process to form a cladding layer to a secondary preform. A quartz glass fibre is pulled from the secondary preform.

A glass has a maximum crystallization rate (KG.sub.max) of at most 0.20 m/min in a temperature range of 700 C. to 1250 C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985. In the case of a sample thickness of 2 mm of the glass, a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1.

A blank made of titanium-doped silica glass for a mirror substrate for use in EUV lithography is provided. The blank includes a surface portion to be provided with a reflective film and having an optically used area (CA) over which a coefficient of thermal expansion (CTE) has a two-dimensional inhomogeneity (dCTE) distribution profile averaged over a thickness of the blank. A maximum inhomogeneity (dCTE.sub.max) of less than 5 ppb/K is defined as a difference between a CTE maximum value and a CTE minimum value. The dCTE.sub.max is at least 0.5 ppb/K. The CA forms a non-circular area having a centroid. The dCTE distribution profile is not rotation-symmetrical and is defined over the CA, such that straight profile sections normalized to a unit length and extending through the centroid of the area yield a dCTE family of curves forming a curve band with a bandwidth of less than 0.5dCTE.sub.max.

A method for manufacturing a glass member, includes: etching the glass member using an etching solution; rinsing the etching solution remaining on a surface of the glass member; and cleaning a sludge layer including a by-product from the etching attached to the surface of the glass member by dipping the glass member in an anionic cleaning solution in which cations are filtered or removed.

The present invention relates to a glass composition having a composite composition system in which a borate composition and a silicate composition are mixed, and disclosed are an eco-friendly detergent glass composition and a method for preparing an eco-friendly detergent glass powder by using same, the composition having maximized elution of ions such as K.sup.+, Na.sup.+, Ca.sup.2+ and Mg.sup.2+, thereby enabling high-concentration elution water to be prepared. Therefore, the eco-friendly detergent glass composition and the method for preparing an eco-friendly detergent glass powder by using same, according to the present invention, enable a predetermined amount of glass to be repeatedly used and washing performance to be maintained constant up to at least 40 cycles.

Disclosed are a luminescent antibacterial glass composition and a method for preparing luminescent antibacterial glass powders including the same, in which a luminescent function is imparted to the antibacterial glass composition, such that whether an antibacterial agent is properly contained in a home appliance component is directly identified using an external light source. As a result, a luminescent oxide as an active agent having a luminescent function is added to a glass structure having the antibacterial function, thereby exhibiting the luminescent function, so that when the antibacterial glass powders are applied to the parts of the home appliance, a consumer and a product manufacturer may easily identify whether the antibacterial agent is contained in the parts.

Provided is a transparent glass ceramic that has sufficiently low viscosity in the melt state, allows effective chemical strengthening by ion exchange, and has high internal strength. The glass ceramic has a composition including, in mol % by oxide equivalent, SiO.sub.2: 55% or more to 70% or less; B.sub.2O.sub.3: over 0% to 10% or less; P.sub.2O.sub.5: over 0% to 5% or less; Li.sub.2O: 18% or more to 30% or less; Na.sub.2O: over 3% to 10% or less; K.sub.2O: 0% or more to 5% or less; and ZrO.sub.2: over 0% to 5% or less. The glass ceramic substantially does not include Al.sub.2O.sub.3.

The methods generally include contacting an alkali-containing glass article having a first alkali metal cation with a molten salt bath including from 0.1 wt. % to 3 wt. % nanoparticles and at least one alkali metal salt having a second alkali metal cation that has an atomic radius larger than an atomic radius of the first alkali metal cation. The nanoparticles may include at least one of metalloid oxide nanoparticles and metal oxide nanoparticles. The methods also include maintaining contact of the glass article with the molten salt bath to allow the first alkali metal cations to be exchanged with the second alkali metal cations of the molten salt bath. Further, the methods may include removing the glass article from contact with the molten salt bath to produce a strengthened glass article. A Surface Hydrolytic Resistance titration volume of the strengthened glass article may be less than 1.5 mL.

A laminate according to an embodiment of the present invention includes at least one glass sheet and at least one resin layer, a relative dielectric constant of the glass sheet at 25 C. and a frequency of 2.45 GHz being 5 or less, and a dielectric loss tangent of the glass sheet at 25 C. and a frequency of 2.45 GHz being 0.003 or less.