Abstract: A method for producing a glass ceramic includes: providing a batch of raw materials; heating the batch of raw materials until a melt is obtained, the batch of raw materials being heated at least in a plurality of sections to a temperature above T3 which corresponds to a viscosity of a molten glass of 103 dPa*s; refining the melt, the melt being heated at least in a plurality of sections to a temperature above T2.5 which corresponds to a viscosity of the molten glass of 102.5 dPa*s; obtaining a refined glass which is configured for being ceramized to form a glass ceramic material; and ceramizing a glass which is configured for being ceramized to form the glass ceramic material, at least one of the step of heating until the melt is obtained and the step of refining being performed with heating by way of H2 and O2 combustion.

Abstract: A method for melting and/or refining glass, glass ceramic or glass which can be ceramized to form glass ceramic includes: providing a batch of raw materials; heating the batch until a melt of molten glass is obtained, the batch being heated at least in sections to a temperature above T3 which corresponds to a viscosity of the molten glass of 103 dPa*s; refining the melt, the melt being heated at least in sections to a temperature above T2.5 which corresponds to a viscosity of the molten glass of 102.5 dPa*s, refining of the melt includes adjusting an oxygen partial pressure p(O2) which is reduced by at least 60% relative to an O2 saturation in the melt at temperature T3; and obtaining a re-fined glass, a refined glass ceramic or a refined glass which can be ceramized to form glass ceramic.

Abstract: A glass-ceramic component is provided that has a low average coefficient of thermal expansion (CTE) and a high CTE homogeneity. The use of such a component and a process for producing such a component are also provided.

Abstract: A borosilicate glass, having a spectral edge wavelength in a UV range of 280 to 325 nm, which can be set in a simple and defined manner, with the composition in percent by weight on an oxide basis of 60–75% SiO2, 10–15% B2O3, 5–15% Na2O, 5–10% K2O, 0–5% Li2O, 0.1–1 CaO, 0.5–3% BaO, >0–1.7% TiO2, 0–0.5% Sb2O3, and normal refining agents.

Abstract: The invention relates to a meltdown device for the production of high-UV transmittive glass types, comprising a meltdown tank for a melt bath a feed opening for the supplying or laying-in of highly pure raw material for the melt bath a draw-off opening for the drawing-off of material melted in the melt tank a cover arranged above the melt tank, in which the infeed opening to the melt tank is arranged above the melt bath in the region of the cover the draw-off opening is arranged in the zone of the bottom of the melt tank a heating arrangement. The heating arrangement comprises heating elements, in particular electrodes that are arranged on the melt tank in the zone of the melt bath, as well as an agitating arrangement for stirring of the melt bath and uniform intermixing and sub-mixing into the melt of material from the mixture lying on the melt surface.

Abstract: A borosilicate glass, having a spectral edge situation in a UV range of 280 to 325 nm, which can be set in a simple and defined manner, with the composition in percent by weight on an oxide basis of 60-75% SiO2, 10-15% B2O3, 5-15% Na2O, 5-10% K2O, 0-5% Li2O, 0.1-1 CaO, 0.5-3% BaO, >0-1.7% TiO2, 0-0.5% Sb2O3, and normal refining agents.

Abstract: The invention relates to a meltdown device for the production of high-UV transmittive glass types, comprising